function chkform()
	{
		var email = document.ajaxg_sign_form.email.value;
		pattern = new RegExp( '^([a-zA-Z0-9\-\.\_]+)(\@)([a-zA-Z0-9\-\.]+)([\.])([a-zA-Z]{2,4})$' );
		if ( !pattern.test(email) )
		{
			alert("Bitte geben Sie Ihre E-Mail Adresse ein!");
			document.ajaxg_sign_form.email.focus();
			return false;
		}
		return true;
  	}

	function send_data( selection )
	{
		if (chkform())
		{
	
	  		document.ajaxg_sign_form.method = "post";
	
	  		if ( selection == "sign_in" )  
	  		{ 
	  			document.ajaxg_sign_form.action = "ajax/sign_in.php?do=sign_in&language=german&ml_id=00";
	  		}
			
			if ( selection == "sign_out" ) 
			{ 
				document.ajaxg_sign_form.action = "ajax/sign_out.php?do=sign_out&language=german&ml_id=00";
			}
	
			document.ajaxg_sign_form.submit();	
		}
	}