I wrote this small thing to check to make sure a zip code was valid. correct leingth, no letters, etc. The small problem is that when someone enters a zip starting with a zero it gives the onblur "your zip is too short" message. Anyone know how i could test an int that starts with a zero and not have the browser think its only 4 digits? I was either thinking of keeping it a string and checking for 5 characters, but i'm not really sure how to do that. the code i have now is:

function zipCheck(x)
{
         myInt = x.value;


			if ((myInt + 1)>0)
			{  
                           if (myInt < 10000)
                           {
                           alert("Your number wasnt long enough");
                           }
                        }

			else{  alert("That is not a valid zip code");  }

}

you could use a regular expression.
this checks for the value having 5 digits or starting with 5 digits followed by a hyphen (-) then 4 digits

function isZipCode(value) {
   var RegExp = /^\d{5}([\-]\d{4})?$/;
   return (RegExp.test(value));
}

o poo, i hate reg expressions. they confuse me to the 10th degree