// JScript File
function switchImg(el, evtType) {
    
    var arr = el.src.split('.gif');
    if(evtType == 'over') {
        if(el.src.indexOf("a.gif") > -1) return;
        el.src = arr[0] + "a.gif";
    } else {
      if(el.sel == null) {
        el.src = arr[0].substring(0, arr[0].length -1) + ".gif";
      }
    }

}