function changeBig(image)
{
var  x = document.images.bigpic;
x.src = image;
}

var win;

function smoke(i){
  if(win && win.open && !win.closed){
  win.focus();
  }else{
  win = window.open('/smoke.php','mywin','left='+((screen.width/2)-200)+',top='+((screen.height/2)-150)+',width=370,height=200,toolbar=0,resizable=0');
  win.focus();
  }
}