function XGRand(num)
{
	var returnNum =0;
	num = num-1;
	 
	if(num>=1)
	{
		returnNum = Math.round(Math.random()*num); 
		
	}
	
	return returnNum;
}

function ClearSearchFormValue()
{
	if(topForm.searchKeyword.value == "请输入关键字...")
     {
        topForm.searchKeyword.value = "";
        topForm.searchKeyword.focus();
    }
}

function fontZoom(size)
{ 
	document.getElementById('detailContent').style.fontSize=size+'px'
}

function log_out()
{
	ht = parent.document.getElementsByTagName("html");
	ht[0].style.filter = "progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)";
	if (confirm('确实想退出？'))
	{
		return true;
	}
	else
	{
		ht[0].style.filter = "";
		return false;
	}
}
function   disableDocument(window)   
  {   
  if   (typeof(_over_label)=="undefined"){   
  document.body.insertAdjacentHTML("beforeEnd",   "<div   id=_over_label   language=javascript"+   
  "   style=\"position:   absolute;   background-color:     #8c8abd;   left:0;   top:100;   z-index:   9999;   filter:alpha(opacity=40)\"></div>");   
  }   
    
  document.body._documentDisabled=true;   
  _over_label.style.width=document.body.clientWidth   +   document.body.scrollLeft;   
  _over_label.style.height=document.body.clientHeight   +   document.body.scrollTop;   
  _over_label.style.visibility="visible";   
  }