x=screen.width;
y=screen.height;

function open_new_window(url)
{ 
new_window = window.open(url,'pop','toolbar=0,menubar=0,resizable=1,scrollbars=1,dependent=0,status=0,width=705,height=550,left='+(x-705)/2+',top='+(y-550)/2);
}

function open_data(url)
{
  new_pop = window.open('data.php?file='+url,'data','scrollbars=1,toolbar=0,menubar=0,resizable=1,dependent=0,status=0,width=200,height=200,left=1,top=1');
}