var imgon=new Array();
var imgoff=new Array();

imgon[0]=new Image();
imgoff[0]=new Image();
imgon[0].src="flashon.gif";
imgoff[0].src="flashoff.gif";
  
imgon[1]=new Image();
imgoff[1]=new Image();
imgon[1].src="htmlon.gif";
imgoff[1].src="htmloff.gif";
  
imgon[2]=new Image();
imgoff[2]=new Image();
imgon[2].src="getflashon.gif";
imgoff[2].src="getflashoff.gif";
  

function rollOn(pic,index){
  var img;
  if(document.getElementById){
    img=document.getElementById(pic);
  }
  else{
    img=document.images[pic];
  }
 
  img.src=imgon[index].src;
 

}

function rollOut(pic,index){

  var img;
  if(document.getElementById){
    img=document.getElementById(pic);
  }
  else{
    img=document.images[pic];
  }
 
  img.src=imgoff[index].src;

}