Forms >>> Limit Boxes.


		<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 
		countChoices(obj)
		{

		max
		=
		2;
		// max. number allowed at a time

		

		box1 
		= 
		obj.form.box1.checked; 
		// your checkboxes here

		box2 
		= 
		obj.form.box2.checked;

		box3 
		= 
		obj.form.box3.checked; 
		// add more if necessary

		

		count 
		=
		(box1
		?
		1
		:
		0)
		+
		(box2
		?
		1
		:
		0)
		+
		(box3
		?
		1
		:
		0);

		// If you have more checkboxes 
		on your form

		// add more  (box_ ? 1 : 0)  's separated by '+'

		

		if
		(count
		>
		max)
		{

		alert("Oops!  
		You can only choose up to " 
		+
		max
		+
		" choices! \nUncheck an option if 
		you want to pick another.");

		obj.checked
		=
		false;

		   
		}

		}

		//  End -->

		</script>

		<form>

		Please choose up to 2 sections:

		<p>

		<input
		type=checkbox
		name=box1
		onClick="countChoices(this)">Section 
		1

		<p>

		<input
		type=checkbox
		name=box2
		onClick="countChoices(this)">Section 
		2

		<p>

		<input
		type=checkbox
		name=box3
		onClick="countChoices(this)">Section 
		3

		<p>

		</form>