function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false;}
else {return true}
}
}function validate_form(thisform)
{
with (thisform)
{
if (validate_required(zip,"Please enter your Zip code!")==false)
  {zip.focus();return false;}
}
}


//function validateZIP(field) {
//var valid = "0123456789-";
//var hyphencount = 0;
//if (field.length!=5 && field.length!=10) {
//alert("Please enter your 5 digit or 5 digit+4 zip code.");
//return false;
//}
//for (var i=0; i < field.length; i++) {
//temp = "" + field.substring(i, i+1);
//if (temp == "-") hyphencount++;
//if (valid.indexOf(temp) == "-1") {
//alert("Invalid characters in your zip code.  Please try again.");
//return false;
//}
//if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
//alert("The hyphen character should be used with a properly formatted 5 digit+four zip code, like '12345-6789'. Please try again.");
//return false;
//   }
//}
//return true;
//}