function preload(pfad){
	var img = new Image();
	img.src = "img/"+pfad;
	done++;
	if(done==6)
	 setTimeout('linking()',4000);
}

function linking(){
	location.href = "main.php";	
}

function position(){
	if(document.all){
		var a=document.body.clientHeight;
		a=(a-648)/2;
		document.getElementById('main').style.marginTop = a+"px";
	}
	else{
		var a=window.innerHeight;
		a=(a-648)/2;
		document.getElementById('main').style.marginTop = a+"px";
	}
	setTimeout('position()',1000);
}