function tmp(a)
{
	alert('Hello');
}
/*
function open_window(url) {
  op_win = window.open(url,'win_name','scrollbars=yes,menubar=no,status=no,width=506,height=350,left=25,top=25')
}
*/
function open_window(url,win_name,w,h)
{
  var hs = screen.height; 
      hs=hs-80;
  var ws = screen.width; 
      ws=ws-10;

  if(h>hs) h = hs ;

  if(w>ws) w = ws ;

  var features = 'directories=no,location=no,menubar=no,status=no,titlebar=no,toolbar=no,resizable=yes,scrollbars=yes,width='+w+',height='+h+',left=0,top=0';
  var newpopup = open(url, win_name, features);
  newpopup.focus();
}