function new_window( datei , x , y )
{
	the_window=window.open( datei,x+y,"toolbar=no,directories=no,menubar=no,location=no,status=no,resizable=no,scrollbars=yes,width="+x+",height="+y+",top=100,left=100");

	if(the_window!=null)
	{
		if(the_window.opener == null) 
		{
			the_window.opener=self;
		}
	}
}

function getkey(e)
{
	if (window.event)
	{
		return window.event.keyCode;
	}else if (e){
		return e.which;
	}else{
		return null;
	}
}

function check_anzahl(e, check) {
	var key, keychar;
	key = getkey(e);

	keychar = String.fromCharCode(key);
	keynumber = parseInt(key);
	
	switch(keynumber) {
	case 8:   // backspace
	case 27:  // escape
	case 35:  // end
	case 36:  // home
	case 37:  // left arrow
	case 39:  // right arrow
	case 0:  // delete
		return (true);
		break;
		
	//case 45:  // insert
	}
	
	if (check.indexOf(keychar.toLowerCase()) > -1)	{
		return (true);
	}else{
		return (false);
	}
}

function check_null(myform)
{
	if (parseInt(myform.menge.value) == 0)
	{
		alert("Sie müssen mindestens ein Stück in den Warenkorb legen.");
		myform.menge.select();
		myform.menge.focus();
		
		return(false);
	}
}