function preCacheIt(imNames, widthArray, heightArray){
  if(document.images){
  l=imNames.length;
  dimArray=new Array(l,2);

    for(i=0;i<imArray.length; i++){
    dimArray[i,0]=widthArray[i];
    dimArray[i,1]=heigthArray[i];
    }
   
  
  imgArray=new Array(l);
    for(i=0;i<l;i++){
    imgArray[i]=new Image(dimArray[i,0],dimArray[i,1]);
    imgArray[i].src = "images/" + imNames[i] + ".jpg";
    }
  }

}

function swapIm(imName, imSRC){
  if(document.images){
  document.getElementById(imName).src = "images/" + imSRC;
  }
}