var highlighting=null

function lowit(obj){
 obj.filters.alpha.opacity=80;
}

function highit(obj){
 obj.filters.alpha.opacity=100;
}

function webchange(url){
  if (url!="")
  {
	 window.open(url);
     return true;
  }
  else
	 return false;
}
//-------------自动滚动-----------------------
var currentpos,timer;

function initialize(){
timer = window.setInterval("scrollwindow()",50);
}

function cs(){
window.clearInterval(timer);
}

function scrollwindow(){
currentpos = document.body.scrollTop;
window.scroll(0,++currentpos);

}

document.onmousedown=cs;
document.ondblclick=initialize;
//-------------------------------------------

function ChgfSize(size){ 
 document.getElementById("content").style.fontSize = size+"px";
}

function chgcolor(color){ 
 document.getElementById("content").style.color = color;
}

//---------------图片变焦----------------------
function zoomimg(img){
  //img.style.zoom获取img对象的缩放比例，并转为十进制整数
  var zoom = parseInt(img.style.zoom,10);
  if (isNaN(zoom)){    //当zoom非数字时zoom默认为100％
    zoom = 100;
  }
  //event.wheelDelta滚轮移动量上移＋120，下移－120；显示比例每次增减10％
  zoom += event.wheelDelta / 12;
  //当zoom大于10％时重新设置显示比例
  if (zoom>10) img.style.zoom = zoom + "%";
}