function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value==""||value=="Zip code")
  {alert(alerttxt);return false;}
else {return true}
}
}

function validate_form(thisform)
{
with (thisform)
{
if (validate_required(zipcode,"Zip code must be filled out!")==false)
  {zipcode.focus();return false;}
}
age1 = document.Search.age1.value
age2 = document.Search.age2.value
if (age2 <= age1 ) {

alert("First age must be greater than Second age");return false;
{age2.focus();return false;}

}
}// JavaScript Document