Forms >>> Validation Zip Code.


		<script 
		language="javascript"
		type="text/javascript">

		/* Visit http://www.yaldex.com/ 
		for full source code

		and get more free JavaScript, CSS and DHTML scripts! */

		<!-- Begin

		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;

		}

		//  End -->

		</script>

		<form
		name=zip
		onSubmit="return 
		validateZIP(this.zip.value)">

		Zip: 
		<input 
		type=text
		size=30
		name=zip>

		<input 
		type=submit
		value="Submit">

		</form>