function toggle(obj) {
		var sibling=(obj.nextSibling.nodeType==3)? obj.nextSibling.nextSibling : obj.nextSibling;
		if(sibling.style.display=='' || sibling.style.display=='block') {
			sibling.style.display='none';
		    obj.firstChild.firstChild.data='+';
		    }
		else {
			sibling.style.display='block';
		    obj.firstChild.firstChild.data='-';
		    }
		}

		function initCollapse() {
		var oDT=document.getElementById('contentA').getElementsByTagName('dt');
		for (var i=0; i < oDT.length; i++) {
			oDT[i].onclick=function() {toggle(this)};
		    var oSpan=document.createElement('span');
		    var sign=document.createTextNode('+');
		    oSpan.appendChild(sign);
		    oDT[i].insertBefore(oSpan, oDT[i].firstChild);
		    oSpan.style.fontFamily='monospace';
		    oSpan.style.paddingRight='0.5em';
		    oDT[i].style.cursor='pointer';
		    toggle(oDT[i]);
			}
		oDT=null;
		}

		function addLoadEvent(func) {
		  var oldonload = window.onload;
		  if (typeof window.onload != 'function') {
		    window.onload = func;
		  } else {
		    window.onload = function() {
		      if (oldonload) {
		        oldonload();
		      }
		      func();
		    }
		  }
		}

		addLoadEvent(function() {
		  if(document.getElementById && document.createElement) {
		    initCollapse();}
		});