function update(form){
        var t=form.select1.selectedIndex;
        var storage=form.select1[t].text;
        if (form.select1[t].value != "none") {
                        var storage=form.select1[t].text;
                        var msg=storage+"                                         "+storage;
                        for (var spot=0;spot<msg.length-storage.length;spot++) {
                                var x=msg.substring(spot,msg.length);
                                form.select1[t].text=x;
                                        for(var d=0;d<150;d++) { };
                        }
                    self.location = (form.select1[t].value);
                    form.select1[t].text=storage;
        } else  {
               form.select1[t].text="Geen echte optie!";
               for(var d=0;d<1250;d++) { };
                form.select1[t].text=storage;
       }
}
function ScreenHeight()
{
 	var ScreenHeight=ScreenHeight=parseFloat(screen.availHeight-50);
 	if(navigator.userAgent.indexOf("Opera") != -1)
 	{
 		ScreenHeight=parseFloat(screen.availHeight-175);
 	}
    return ScreenHeight;
 }