var nW,nH,oH,oW;
  function zoomToggle(iWideSmall,iHighSmall,iWideLarge,iHighLarge,whichImage){
    oW=whichImage.style.width;oH=whichImage.style.height;
    if((oW==iWideLarge)||(oH==iHighLarge)){
      nW=iWideSmall;nH=iHighSmall;
    }else{
      nW=iWideLarge;nH=iHighLarge;
    }
    whichImage.style.width=nW;whichImage.style.height=nH;
  }