var imgHttp = "http://www.hschau.com/jpg/"
function  attachImgEventListener() 
{  
 var imageArray=document.getElementById("Limg").getElementsByTagName("img");
    for(var i=0;i<imageArray.length;i++) 
    {
       imageArray[i].onmouseover=imgOverListener;
     imageArray[i].onmouseout=imgOutListener;
    }
}
function imgOverListener(event)
{
 var event=event || window.event;
 var source = event.srcElement || event.target;
 var ImgName = source.id;
 if (ImgName != "noneimg"){ source.src=""+imgHttp+""+ImgName+"b.gif";}

}
function imgOutListener(event)
{
 var event=event || window.event;
 var source = event.srcElement || event.target;
 var ImgName = source.id;
 if (ImgName != "noneimg"){ source.src=""+imgHttp+""+ImgName+"a.gif";}
}