function validate()
	{	
		if(document.contact_us.fname.value=="")
		{
			alert("Please enter your name.");
			document.contact_us.fname.focus();
			return false;		
		}
		
		var checkString = document.contact_us.fname.value;
		if (checkString != "") 
		{	
			if ( /[^\w ]/.test(checkString))
			{
				alert("Please enter only letter and numeric characters.");
				document.contact_us.fname.focus();
				return (false);
			}	
		}
		
		if(document.contact_us.email.value=="")
		{
			alert("Please specify your email address.");
			document.contact_us.email.focus();
			return false;
		}
		
		if(document.contact_us.email.value!="")
		{
			var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
			var address = document.contact_us.email.value;
			
			if(reg.test(address) == false) 
			{
				alert('Invalid email address.');
				document.contact_us.email.focus();
				return false;
			}
		}
	}