function clickHandler() {
  var targetId, srcElement, targetElement;
  srcElement = window.event.srcElement;
  if (srcElement.className == "hiddenright") {
     targetId = "menuBlock";	  	
     targetElement = document.all(targetId);
     if (targetElement.style.display == "none") {
        targetElement.style.display = "";   
		document.all("contentBlock").style.width="640px";
		document.all("sqiang2").style.right="250px";
		document.all("sqiang2").style.backgroundImage="url(/Web_Class/i/hlf.gif)"

     } 
	    else {
        targetElement.style.display = "none";
		document.all("contentBlock").style.width="98%";
		document.all("sqiang2").style.right="5px";
		document.all("sqiang2").style.backgroundImage="url(/Web_Class/i/hrf.gif)"
     }
  }
}
document.onclick = clickHandler;