function ad_show(width) { //显示广告函数
ad_width=(width-800)/2;
left_div=(ad_width-100)/2; //得到左边栏的left位置
//right_div=ad_width+820+left_div; //得到右边栏的left位置
right_div=1130; //得到右边栏的left位置
left_str="<div id='adleft' style='position:absolute;top:100px;left:0px;width:147px;height:146px;z-index:2007;'><img src='images/phone.jpg' width='91' height='128' /></div>";
right_str="<div id='adright' style='position:absolute;top:60px;left:" + right_div + "px;width:79px;height:224px;z-index:2008;padding:0px;'><table height='224' cellspacing='0' cellpadding='0'><tr><td><img src='images/qq01.png' width='79' height='42' /></td></tr><tr><td><a href='tencent://message/?uin=1055736238&amp;Site=中西协会&amp;Menu=yes' target='_blank'><img src='images/qq02.png' width='79' height='63' /></a></td></tr><tr><td><a href='tencent://message/?uin=25039408&amp;Site=中西协会&amp;Menu=yes' target='_blank'><img src='images/qq02.png' width='79' height='63' /></a></td></tr><tr><td><a href='skype:estudiantes2009?call' target='_blank'><img src='images/qq03.png' width='79' height='49' /></a></td></tr><tr><td><a href='msnim:chat?contact=estudiante_agencia@hotmail.com' target='_blank'><img src='images/qq04.png' width='79' height='45' /></a></td></tr><tr><td><img src='images/qq05.png' width='79' height='25' /></td></tr></table></div>";
//document.write(left_str);
document.write(right_str);
}

function updown(){ //随滚动条滚动函数
//document.getElementById("adleft").style.top=(document.documentElement.scrollTop+76)+"px";
document.getElementById("adright").style.top=(document.documentElement.scrollTop+60)+"px";;
}

var wd=screen.width;
if(wd>800){ //若分辨率宽度大于800个像素则执行上面两个函数
ad_show(wd);
window.onscroll=updown;
}