function mask(str,textbox,loc,delim){
var locs = loc.split(',');

for (var i = 0; i <= locs.length; i++){
	for (var k = 0; k <= str.length; k++){
	 if (k == locs[i]){
	  if (str.substring(k, k+1) != delim){
	   if (event.keyCode != 8){ //backspace
	    str = str.substring(0,k) + delim + str.substring(k,str.length);
       }
	  }
	 }
	}
 }
textbox.value = str
}

function handleEnter (field, event) {
	var keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
	if (keyCode == 13) {
		var i;
		for (i = 0; i < field.form.elements.length; i++)
			if (field == field.form.elements[i])
				break;
		i = (i + 1) % field.form.elements.length;
		field.form.elements[i].focus();
		return false;
	} 
	else
	return true;
}