browserName=navigator.appName.substring(0,8);
browserVer=parseInt(navigator.appVersion);
version=0;
if ((browserName=="Netscape")&&(browserVer>=3)) version=1;
if ((browserName=="Microsof")&&(browserVer>=4)) version=1;


if (version)  {    
var t=0;
li=new Array (document.images.length);
while (t < document.images.length) {
this.li[t]=new Image();
  this.li[t].src=document.images[t].lowsrc;
t=t+1;
  }
}