function fenster(url)
{
 xpos=(screen.availWidth-500)/2;
 ypos=(screen.availHeight-500)/2;
 F1= window.open(url,"produktFrame","scrollbars=no,width=500,height=500,status=no,menubar=no,toolbar=no");
 F1.moveTo(xpos,ypos);
 F1.focus();
}

function anfahrt(url)
{
 xpos=(screen.availWidth-500)/2;
 ypos=(screen.availHeight-500)/2;
 F1= window.open(url,"produktFrame","scrollbars=no,width=500,height=500,status=no,menubar=no,toolbar=no");
 F1.moveTo(xpos,ypos);
 F1.focus();
}