function add_referenceFields(){
	/* Miramos el numero de campo */
	num = parseInt($("RefForm_Num").value);
	num = num + 1;
	$("RefForm_Num").value = num;
	/* Añadimos elementos */
	html  = "<div class=\"Prod_Divider\">Product "+num+"</div>";
	html += "<label for=\"RefForm_Customer_"+num+"\">Customer email:</label><input name=\"RefForm_Customer_"+num+"\" id=\"RefForm_Customer_"+num+"\" type=\"text\" />";
	html += "<label for=\"RefForm_Date_"+num+"\">Sale Date:</label><input name=\"RefForm_Date_"+num+"\" id=\"RefForm_Date_"+num+"\" type=\"text\" />";
	html += "<label for=\"RefForm_Prod_"+num+"\">Product:</label>";
	html += "<select id=\"RefForm_Prod_"+num+"\" name=\"RefForm_Prod_"+num+"\">";
	html += "	<option value=\"PB-06\">PearlBlue</option>";
	html += "	<option value=\"SbPB\">RS232 for PearlBlue</option>";
	html += "	<option value=\"uIB-07\">uIceBlue2</option>";
	html += "	<option value=\"BTIO-07\">BTswitch I/O</option>";
	html += "	<option value=\"SCBT-08\">BTswitch Source Code</option>";
	html += "	<option value=\"BTB-08\">BTswitch Box</option>";
	html += "</select>";
	$("RefForm_Button").insert({before: html});
}
function generateTapes(){
	var string = "";
	num = parseInt( $("tape_cell_num").value );
	for(i=0;i<num;i++){
		string += $("tape_reference_"+i).value + "-|-" + $("tape_cell_"+i).value + "-{}-";
	}
	window.open("./php/reference_tapes.php?reference="+string);
}