/**
*安博软件  古雪鹏  2005.1.11
* 使用说明
* 调用页面的写法为
*
* <div id=a></div>
<SCRIPT language=JavaScript>
var a=new Chip("a",300*Math.random(),150*Math.random());
</SCRIPT>
<SCRIPT event=onload for=window language=JavaScript>
pagestart("a");
</SCRIPT>
*/
function Chip(chipname,width,height)
{
	var timer1;
	this.named=chipname;
 this.vx=2+5*Math.random();
 this.vy=2+5*Math.random();
 this.w=width;
 this.h=height;
 this.xx=800*Math.random();
 this.yy=600*Math.random();
 this.timer1=null;
}

function movechip(chipname)
{
	var vr=0.02;
	var brOK=false;
	var mie=false;

	if(navigator.appName.indexOf("Internet Explorer")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();
		mie=true;
	   }
	 if(navigator.appName.indexOf("Netscape")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();}

 if(brOK)
  {
	 eval("chip="+chipname);
   if(!mie)
    {pageX=window.pageXOffset;
     pageW=window.innerWidth;
     pageY=window.pageYOffset;
     pageH=window.innerHeight;
    }
   else
    {pageX=window.document.body.scrollLeft;
     pageW=window.document.body.offsetWidth-22;
     pageY=window.document.body.scrollTop;
     pageH=window.document.body.offsetHeight-34;
    }

   chip.xx=chip.xx+chip.vx;
   chip.yy=chip.yy+chip.vy;

   chip.vx+=vr*(Math.random()-0.5);
   chip.vy+=vr*(Math.random()-0.5);
   if(chip.vx>(5+2))  chip.vx=(5+2)*2-chip.vx;
   if(chip.vx<(-5-2)) chip.vx=(-5-2)*2-chip.vx;
   if(chip.vy>(5+2))  chip.vy=(5+2)*2-chip.vy;
   if(chip.vy<(-5-2)) chip.vy=(-5-2)*2-chip.vy;


   if(chip.xx<=pageX)
     {chip.xx=pageX;
      chip.vx=2+5*Math.random();
     }
   if(chip.xx>=pageX+pageW-chip.w)
     {chip.xx=pageX+pageW-chip.w;
      chip.vx=-2-5*Math.random();
     }
   if(chip.yy<=pageY)
     {chip.yy=pageY;
      chip.vy=2+5*Math.random();
     }
   if(chip.yy>=pageY+pageH-chip.h)
     {chip.yy=pageY+pageH-chip.h;
      chip.vy=-2-5*Math.random();
     }

   if(!mie)
      {eval('document.'+chip.named+'.top ='+chip.yy);
       eval('document.'+chip.named+'.left='+chip.xx);
      }
   else
      {eval('document.all.'+chip.named+'.style.pixelLeft='+chip.xx);
       eval('document.all.'+chip.named+'.style.pixelTop ='+chip.yy);
      }
   chip.timer1=setTimeout("movechip('"+chip.named+"')",140);
  }
}

function hide(chipname){
	var brOK=false;
	var mie=false;

	if(navigator.appName.indexOf("Internet Explorer")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();
		mie=true;
	   }
	 if(navigator.appName.indexOf("Netscape")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();}

	if(brOK){
		eval("chip="+chipname);
		if(!mie)
			eval('document.'+chip.named+'.visibility ='+"'hide'");
		else
			eval('document.all.'+chip.named+'.style.visibility ='+"'hidden'");
	}
}

function stopme(chipname)
{
	var brOK=false;
	var mie=false;

	if(navigator.appName.indexOf("Internet Explorer")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();
		mie=true;
	   }
	 if(navigator.appName.indexOf("Netscape")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();}

	if(brOK)
  {//alert(chipname)
   eval("chip="+chipname);
   if(chip.timer1!=null)
    {clearTimeout(chip.timer1)}
  }
}

function pagestart(name)
{
	var brOK=false;
	var mie=false;

	if(navigator.appName.indexOf("Internet Explorer")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();
		mie=true;
	   }
	 if(navigator.appName.indexOf("Netscape")!=-1)
	   {if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();}

	 if(brOK){
		 movechip(name);
	}
}
//if(brOK) {stopme('chip1');}