function disableOption(sender, field, field2, field3){

	var oField = document.forms[0][field];
	var oField2 = document.forms[0][field2];
	var oField3 = document.forms[0][field3];
	
		if(sender.options[sender.selectedIndex].value == "0"){
			 var oField_options = oField.options;
			 for(var i = 0; i < oField_options.length; i++){
				  if(oField_options[i].value > "0")
					 oField_options[i].selected = "selected";
			 }
		} else if (sender.options[sender.selectedIndex].value > "0") {
			 var oField_options = oField.options;
			 for(var i = 0; i < oField_options.length; i++){
				  if(oField_options[i].value == "0")
					 oField_options[i].selected = "selected";
			 }
		}
if(sender.options[sender.selectedIndex].value == "0"){
			 var oField2_options = oField2.options;
			 for(var i = 0; i < oField2_options.length; i++){
				  if(oField2_options[i].value > "0")
					 oField2_options[i].selected = "selected";
			 }
		} else if (sender.options[sender.selectedIndex].value > "0") {
			 var oField2_options = oField2.options;
			 for(var i = 0; i < oField2_options.length; i++){
				  if(oField2_options[i].value == "0")
					 oField2_options[i].selected = "selected";
			 }
		}
if(sender.options[sender.selectedIndex].value == "0"){
			 var oField3_options = oField3.options;
			 for(var i = 0; i < oField3_options.length; i++){
				  if(oField3_options[i].value > "0")
					 oField3_options[i].selected = "selected";
			 }
		} else if (sender.options[sender.selectedIndex].value > "0") {
			 var oField3_options = oField3.options;
			 for(var i = 0; i < oField3_options.length; i++){
				  if(oField_options[i].value == "0")
					 oField3_options[i].selected = "selected";
			 }
		}
}