window.onload = showBox;
	var windowInfo;
	function showBox(){
		windowInfo = getWindowInfo();
		var btn = document.getElementById('btn');
		btn.onclick = function(){
			var zhezhao = document.getElementById('zhezhao');
			var clewBox = document.getElementById('clewBox');
			var clear = document.getElementById('clear');
			var width = document.getElementsByTagName('body')[0].offsetWidth;
			var height = document.getElementsByTagName('body')[0].offsetHeight;
			window.onscroll = setOffset(clewBox);
			zhezhao.style.display = 'block';
			zhezhao.style.width = width + 'px';
			zhezhao.style.height = height + 'px';
			
			clewBox.style.display = 'block';
			setOffset(clewBox)();
			clear.onclick = function(){
				window.onscroll = function(){};
				clewBox.style.display = 'none';
				zhezhao.style.display = 'none';
			}
		}
	}
	
	function setOffset(element){
		return function(){
			element.style.top = (windowInfo.Height/2-element.offsetHeight/2+document.documentElement.scrollTop)+"px";
			element.style.left = (windowInfo.Width/2-element.offsetWidth/2)+"px";
		}
	}
function changenav(n)
{
for(i=1;i<7;i++)
{
 eval("document.getElementById('global_nav"+i+"').className=''");
}
eval("document.getElementById('global_nav"+n+"').className='on'");

for(i=1;i<7;i++)
{
  eval("document.getElementById('child_nav"+i+"').style.display='none'")
}
  eval("document.getElementById('child_nav"+n+"').style.display='block'");
}

//
function changeform(n)
   {
    for(i=1;i<5;i++)
    {
     eval("document.getElementById('box"+i+"').className=''");
    }
    eval("document.getElementById('box"+n+"').className='on'");
    
    for(i=1;i<5;i++)
    {
      eval("document.getElementById('form"+i+"').style.display='none'")
    }
      eval("document.getElementById('form"+n+"').style.display='block'");
   }