var popUpWin=0;
function entersite()
{
var URLStr="main.php";
var height=screen.height;
var width=screen.width;
var left = ((screen.width/2) - width/2)-5;
var top = ((screen.height/2) - height/2)-5;
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}


var popUpWin2=0;
function popW(URLStr,height,width){
var left = ((screen.width/2) - width/2)-5;
var top = ((screen.height/2) - height/2)-5;
if(popUpWin2)

  {

    if(!popUpWin2.closed) popUpWin2.close();

  }
	popUpWin2 = open(URLStr, 'popUpWin2', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');

}