function validate(el)
{
	if(document.form.name.value=="")
	{
		alert("Please Enter Your Name");
		document.form.name.focus();
		return false;
	}

	if(document.form.email.value!="")
	{
		var str = document.form.email.value;
		var re = /^([a-zA-Z0-9-_\.]+@([a-zA-Z0-9-_]+\.)+[a-zA-Z]{2,4})$/;
		if (re.test(str))
		{	
			//return true;
		}	
		else
		{
			alert("" + str + " is not a valid email address");
			document.form.email.focus();
			return false;
		}
	}
	if(document.form.message.value=="")
	{
		alert("Please Enter Nachricht");
		document.form.message.focus();
		return false;
	}
}