Forms >>> Upload Filter.


		<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

		extArray 
		=
		new
		Array(".gif",
		".jpg",
		".png");

		function 
		LimitAttach(form, 
		file)
		{

		allowSubmit 
		=
		false;

		if
		(!file)
		return;

		while
		(file.indexOf("\\") 
		!= -1)

		file 
		= 
		file.slice(file.indexOf("\\") 
		+ 1);

		ext 
		= 
		file.slice(file.indexOf(".")).toLowerCase();

		for
		(var 
		i =
		0; 
		i < 
		extArray.length; 
		i++)
		{

		if
		(extArray[i]
		== 
		ext)
		{ 
		allowSubmit =
		true;
		break;
		}

		}

		if
		(allowSubmit)
		form.submit();

		else

		alert("Please 
		only upload files that end in types:  "

		+
		(extArray.join("  
		"))
		+
		"\nPlease select a new "

		+
		"file to upload and submit 
		again.");

		}

		//  End -->

		</script>

		Please upload only images that end in:

		<script>

		document.write(extArray.join("  
		"));

		</script>

		<p>

		

		<form
		method=post
		name=upform
		action="/cgi-bin/some-script.cgi"
		enctype="multipart/form-data">

		<input 
		type=file
		name=uploadfile>

		<p>

		<input
		type=button
		name="Submit"
		value="Submit"
		onclick="LimitAttach(this.form, 
		this.form.uploadfile.value)">

		</form>