function wopen(wurl,w,h) {
var wstr = 'toolbar=0, location=0, directoties=0, status=0, menubar=0, scrollbars=1, resizable=0, width=' + w +', height=' + h;
window.open (wurl, 'Picture', wstr);
}
<!-- Begin
function showImg(img){
  myImg= new Image();
  myImg.src=(img);
  OpenImg(img);
}
function OpenImg(img){
  if((myImg.width!=0)&&(myImg.height!=0)){
    viewImg(img);
  }
  else{
    func="OpenImg('"+img+"')";
    showTimer=setTimeout(func,20);
  }
}
function viewImg(img){
  miWidth=myImg.width+20;
  miHeight=myImg.height+40;
  paramString="width="+miWidth+",height="+miHeight;
  result=window.open('showimg.php?imgpath='+img,"",paramString);
}
//  End -->