// JavaScript Document

function swapImg(imgsrc, id) {
      var image=new Image();
	  image.src = imgsrc;
if (document.images)
  {
    if (image && image.complete)
    {
      var target=0;
	  if (id)
        target=id; 
      if (document.getElementById(id))
        target=document.getElementById(id);
	   
      // make sure target is valid.  It might not be valid
      //   if the page has not finished loading
      if (target)
      {		
        target.src=image.src;
      }
    }
  } 	
}