<!--
function chkMailFormular()
{
	if(document.getElementById('mail_username').value == ""){
    	alert("Please enter your name.");
	    document.getElementById('mail_username').focus();
	    return false;
	}
	
	if(document.getElementById('mail_emailaddress').value == "" || document.getElementById('mail_emailaddress').value.match(/\w*@\w.*\.\w\w*/)==null){
	    alert("Please enter a valid email address.");
	    document.getElementById('mail_emailaddress').focus();
	    return false;
	}
	
	if(document.getElementById('mail_message').value == ""){
	    alert("Please enter a message.");
	    document.getElementById('mail_message').focus();
	    return false;
	}
}
//-->