function doCalculationTopO(calc_type){
		var error_message = "At least three of the four fields must be filled out.<br />Only integers and decimals are excepted.<br /><br />";
		var bed_size = $("#bed_size").val();
		var the_rows = $("#the_rows").val();
		var plant_spacing_feet = $("#plant_spacing_feet").val();
		var plants_per_acre = $("#plants_per_acre").val();
		//var number_acres = $("#number_acres").val();
		//var total_plants = $("#total_plants").val();
		var fixed_ratio = 43560;
		
		var good_fields = 0;
		var uf_bed_size = 0;
		var uf_the_rows = 0;
		var uf_plant_spacing_feet = 0;
		var uf_plants_per_acre = 0;
		var uf_number_acres = 0;
		

		var plant_sp_by = $("input[@name='plant_sp_by']:checked").val();
		var bed_size_by = $("input[@name='bed_size_by']:checked").val();
		
		if(validateField(bed_size)){
			uf_bed_size = 1;
			good_fields++;
		}
		else{
			error_message += "Bed size is formatted incorrectly.<br />";
		}
		if(validateField(the_rows)){
			uf_the_rows = 1;
			good_fields++;
		}
		else{
			error_message += "Number of rows is formatted incorrectly.<br />";
		}
		if(validateField(plant_spacing_feet)){
			uf_plant_spacing_feet = 1;
			good_fields++;
		}
		else{
			error_message += "Plant spacing is formatted incorrectly.<br />";
		}
		if(validateField(stripCommas(plants_per_acre))){
			uf_plants_per_acre = 1;
			good_fields++;
		}
		else{
			error_message += "Plants Per Acre is formatted incorrectly.<br />";
		}
		/*if(!validateField(stripCommas(number_acres)) && !calc_type ){
			$("#number_acres").val(1);
			number_acres = 1;
		}
		if(!validateField(stripCommas(total_plants)) && calc_type ){
			$("#total_plants").val(1000);
			total_plants = 1000;
		}*/
		if(good_fields > 2){
			//do the calculation
			/*		
				PPA = 43,560 / ( (PS * B) / R )
				B = (43,560 * R) / (PPA * PS)
				PS = (43,560 * R) / (PPA * B)
				R = (PPA * PS * B) / 43,560
			*/
			if(uf_plant_spacing_feet && (plant_sp_by == "inches")){
				plant_spacing_feet = plant_spacing_feet / 12;
			}
			if(uf_bed_size && (bed_size_by == "inches")){
				bed_size = bed_size / 12;
			}
			
			
			if(uf_plant_spacing_feet &&  uf_the_rows && uf_bed_size){
				//PPA = 43,560 / ( (PS * B) / R )
				
				plants_per_acre = addCommas(Math.round( fixed_ratio / ( (plant_spacing_feet * bed_size) / the_rows )));
				$("#plants_per_acre").val( plants_per_acre );
			}
			else{
				if(uf_plant_spacing_feet && uf_plants_per_acre &&  uf_the_rows){
					//B = (43,560 * R) / (PPA * PS)
					divide_by = 1;
					if(bed_size_by == "inches"){
						divide_by = 12;
					}
					bed_size = Math.round(100*((fixed_ratio * the_rows) / (stripCommas(plants_per_acre) * plant_spacing_feet)) * divide_by)/100;
					$("#bed_size").val( bed_size );
				}
				else{
					if(uf_plants_per_acre &&  uf_the_rows && uf_bed_size){
						//PS = (43,560 * R) / (PPA * B)
						divide_by = 1;
						if(plant_sp_by == "inches"){
							divide_by = 12;
						}
						plant_spacing_feet = Math.round(100*((fixed_ratio * the_rows) / (stripCommas(plants_per_acre) * bed_size)) * divide_by)/100;
						$("#plant_spacing_feet").val( plant_spacing_feet );
					}
					else{
						if(uf_plant_spacing_feet && uf_plants_per_acre && uf_bed_size){
							//R = (PPA * PS * B) / 43,560
							the_rows = Math.ceil((stripCommas(plants_per_acre) * plant_spacing_feet * bed_size) / fixed_ratio);
							$("#the_rows").val( the_rows );
						}
					}
				}
			}
			$("#plant_spacing_feet_button").show();
			$("#plant_spacing_feet_button").show();
			$("#error_message").html("");
			/*if(calc_type){
				var result = Math.round(1000*stripCommas(total_plants) / stripCommas(plants_per_acre))/1000; 
				$("#number_acres").val(addCommas(result));
			}
			else{
				var result = Math.round(stripCommas(plants_per_acre) * stripCommas(number_acres)); 
				$("#total_plants").val(addCommas(result));
			}*/
		}
		else{
			$("#error_message").html(error_message+"<br />");
		}
	}
	
	function validateField(field_value){
		var floatExpression = /^((\d+(\.\d*)?)|((\d*\.)?\d+))$/;
		var integerExpression = /^\d+$/;
		if((field_value.match(floatExpression) || field_value.match(integerExpression)) && field_value != 0 && field_value != ""){
			return true;
		}else{
			return false;
		}
	}
	
	function addCommas(nStr){
		nStr += '';
		x = nStr.split('.');
		x1 = x[0];
		x2 = x.length > 1 ? '.' + x[1] : '';
		var rgx = /(\d+)(\d{3})/;
		while (rgx.test(x1)) {
			x1 = x1.replace(rgx, '$1' + ',' + '$2');
		}
		return x1 + x2;
	}
	
	function stripCommas(numString) {
		var re = /,/g;
		return numString.replace(re,"");
	}

	function doCalculationTop(calc_type){
		var error_message = "At least three of the four fields must be filled out.<br />Only integers and decimals are excepted.<br /><br />";
		var bed_size = $("#bed_size").val();
		var the_rows = $("#the_rows").val();
		var plant_spacing_feet = $("#plant_spacing_feet").val();
		var plants_per_acre = $("#plants_per_acre").val();
		//var number_acres = $("#number_acres").val();
		//var total_plants = $("#total_plants").val();
		var fixed_ratio = 43560;
		
		var good_fields = 0;
		var uf_bed_size = 0;
		var uf_the_rows = 0;
		var uf_plant_spacing_feet = 0;
		var uf_plants_per_acre = 0;
		var uf_number_acres = 0;
		

		var plant_sp_by = $("input[@name='plant_sp_by']:checked").val();
		var bed_size_by = $("input[@name='bed_size_by']:checked").val();
		
		if(validateField(bed_size)){
			uf_bed_size = 1;
			good_fields++;
		}
		else{
			error_message += "Bed size is formatted incorrectly.<br />";
		}
		if(validateField(the_rows)){
			uf_the_rows = 1;
			good_fields++;
		}
		else{
			error_message += "Number of rows is formatted incorrectly.<br />";
		}
		if(validateField(plant_spacing_feet)){
			uf_plant_spacing_feet = 1;
			good_fields++;
		}
		else{
			error_message += "Plant spacing is formatted incorrectly.<br />";
		}
		if(validateField(stripCommas(plants_per_acre))){
			uf_plants_per_acre = 1;
			good_fields++;
		}
		else{
			error_message += "Plants Per Acre is formatted incorrectly.<br />";
		}
		
		if(uf_plant_spacing_feet && (plant_sp_by == "inches")){
			plant_spacing_feet = plant_spacing_feet / 12;
		}
		if(uf_bed_size && (bed_size_by == "inches")){
			bed_size = bed_size / 12;
		}
		
		
		switch(calc_type){
			case 1:{
				if(uf_plant_spacing_feet && uf_plants_per_acre &&  uf_the_rows){
					//B = (43,560 * R) / (PPA * PS)
					divide_by = 1;
					if(bed_size_by == "inches"){
						divide_by = 12;
					}
					bed_size = Math.round(100*((fixed_ratio * the_rows) / (stripCommas(plants_per_acre) * plant_spacing_feet)) * divide_by)/100;
					$("#bed_size").val( bed_size );
				}
				break;	
			}
			case 2:{
				if(uf_plants_per_acre &&  uf_the_rows && uf_bed_size){
					//PS = (43,560 * R) / (PPA * B)
					divide_by = 1;
					if(plant_sp_by == "inches"){
						divide_by = 12;
					}
					plant_spacing_feet = Math.round(100*((fixed_ratio * the_rows) / (stripCommas(plants_per_acre) * bed_size)) * divide_by)/100;
					$("#plant_spacing_feet").val( plant_spacing_feet );
				}
				break;	
			}
			case 3:{
				if(uf_plant_spacing_feet && uf_plants_per_acre && uf_bed_size){
							//R = (PPA * PS * B) / 43,560
					the_rows = Math.round(100*(stripCommas(plants_per_acre) * plant_spacing_feet * bed_size) / fixed_ratio)/100;
					$("#the_rows").val( the_rows );
				}
				break;	
			}
			case 4:{
				if(uf_plant_spacing_feet &&  uf_the_rows && uf_bed_size){
					//PPA = 43,560 / ( (PS * B) / R )
				
					plants_per_acre = addCommas(Math.round( fixed_ratio / ( (plant_spacing_feet * bed_size) / the_rows )));
					$("#plants_per_acre").val( plants_per_acre );
				}
				break;	
			}
		}
		activateButtons();
	}
	
	function activateButtons(){
		//alert("activateButtons");
		var bed_size = $("#bed_size").val();
		var the_rows = $("#the_rows").val();
		var plant_spacing_feet = $("#plant_spacing_feet").val();
		var plants_per_acre = $("#plants_per_acre").val();

		var good_fields = 0;
		var uf_bed_size = 0;
		var uf_the_rows = 0;
		var uf_plant_spacing_feet = 0;
		var uf_plants_per_acre = 0;
		var error_message = "";

		if(validateField(bed_size)){
			uf_bed_size = 1;
			good_fields++;
		}
		else{
			error_message += "Bed size is formatted incorrectly.<br />";
		}
		if(validateField(the_rows)){
			uf_the_rows = 1;
			good_fields++;
		}
		else{
			error_message += "Number of rows is formatted incorrectly.<br />";
		}
		if(validateField(plant_spacing_feet)){
			uf_plant_spacing_feet = 1;
			good_fields++;
		}
		else{
			error_message += "Plant spacing is formatted incorrectly.<br />";
		}
		if(validateField(stripCommas(plants_per_acre))){
			uf_plants_per_acre = 1;
			good_fields++;
		}
		else{
			error_message += "Plants Per Acre is formatted incorrectly.<br />";
		}
		///turn on the correct button
		//alert(good_fields);
		
		if(good_fields < 3){
			$("#bed_size_button").attr("disabled", "true");
			$("#the_rows_button").attr("disabled", "true");
			$("#plant_spacing_feet_button").attr("disabled", "true");
			$("#plants_per_acre_button").attr("disabled", "true");
		}
		
		if(good_fields == 3){
			$("#bed_size_button").attr("disabled", "true");
			$("#the_rows_button").attr("disabled", "true");
			$("#plant_spacing_feet_button").attr("disabled", "true");
			$("#plants_per_acre_button").attr("disabled", "true");

			if(uf_bed_size == 0){
				$("#bed_size_button").removeAttr('disabled');
			}
			if(uf_the_rows == 0){
				$("#the_rows_button").removeAttr('disabled');
			}
			if(uf_plant_spacing_feet == 0){
				$("#plant_spacing_feet_button").removeAttr('disabled');
			}
			if(uf_plants_per_acre == 0){
				$("#plants_per_acre_button").removeAttr('disabled');
			}
		}
		// turn on all buttons
		if(good_fields == 4){
			//alert($("#bed_size_button").attr("disabled", "true"));
			$("#bed_size_button").removeAttr('disabled');
			$("#the_rows_button").removeAttr('disabled');
			$("#plant_spacing_feet_button").removeAttr('disabled');
			$("#plants_per_acre_button").removeAttr('disabled');
		}
	}
	function activateButtons2(){
		alert("activateButtons2");
	}