<script>
<!-- //
 
	function good_add(eiv)
	{
		var teste = false;
		var strtest = new String(eiv);
		var index = strtest.indexOf("@");
 
		if (index > 0)
		{
			var eid = strtest.indexOf(".",index);
 
			if (eid > index+1 && strtest.length > eid+1)
			{
				teste = true;
			}
 
			return teste;
		}
	}
 
	function validate()
	{
		var e = '';
 
		for (var i = 0; i < document.test.elements.length; i++)
		{
    			var j = document.test.elements[i];
 
			switch (j.type)
			{
				case 'text':
 
 
				if (j.name == 'email')
				{
					if (j.value == '')
					{
						e += "Please enter a valid email\n";
					}
					else if (!good_add(j.value))
					{
						e += "Please enter a valid email\n";
					}
				}
 
				/* other 'input' type elements go here */
 
				break;
 
				case 'select-one':
 
				if (j.name == 'zip' && j.selectedIndex == 0)
				{
					e += "Please select a valid zip code\n";
				}
 
				/* other 'select' type elements go here */
 
				break;
 
				case 'checkbox':
 
				if (j.type == 'checkbox' && !j.checked)
				{
					e += "You must agree to our rules\n";
				}
 
				/* other 'checkbox' type elements go here */
 
				break;
			}
		}
 
		if ( e )
		{
			alert(e);
 
			return false;
		}
		else
		{
			/* submit would go here */
 
			// document.test.submit();
			// return true;
 
			alert('thanks for validating our form');
 
			return false;
		}
	}
// -->
</script>
 
 
<form name='test' action='process.php' onsubmit='return validate();' method='post'>
email <input type='text' name='email' value=''>
<br />
zip code <select name='zip'>
<option value=''>Select Zip Code
<option value='33510'>33510
<option value='02112'>02112</select>
<br />
<input type='checkbox' name='agree' value='1'> <small>do you agree with the rules</small>
<br />
<input type='submit' name='submit' value='Send'>
</form>