function setValue(input,value) {
   if (input.value == "") {
	  formname = input.form.name;
	  inputname = input.name;
	  input.value = value;
	  if (typeof(clean[formname])=='undefined') { 
		 clean[formname] = new Array();
	  }
	  clean[formname][inputname] = true;
   }
}

var clean = new Array();
function cleanValue(input) {
	formname = input.form.name;
   inputname = input.name;
   if (typeof(clean[formname])!='undefined')
	  if (clean[formname][inputname]) {
		 input.value = "";
		 clean[formname][inputname] = false;
	  }
}