js下部フローティング広告コード

if(typeof document.compatMode!='undefined'&&document.compatMode!='BackCompat'){
    cot_t1_DOCtp="_top:expression(document.documentElement.scrollTop+document.documentElement.clientHeight-this.clientHeight);_left:expression(document.documentElement.scrollLeft + document.documentElement.clientWidth - offsetWidth);}";
}else{
    cot_t1_DOCtp="_top:expression(document.body.scrollTop+document.body.clientHeight-this.clientHeight);_left:expression(document.body.scrollLeft + document.body.clientWidth - offsetWidth);}";
}
var fdcCSS='#wgcss_dingwei {position:fixed;';
var fdcCSS=fdcCSS+'_position:absolute;';
var fdcCSS=fdcCSS+'width:100%;';
var fdcCSS=fdcCSS+'text-align:center;';
var fdcCSS=fdcCSS+'bottom:0px;';
var fdcCSS=fdcCSS+'right:0px;';
var fdcCSS=fdcCSS+'clip:rect(0 100% 100% 0);';
var fdcCSS=fdcCSS+cot_t1_DOCtp;
document.write('<style type=\"text\/css\">'+fdcCSS+'<\/style>');
document.write('<div id="wgcss_dingwei"><img src="images/bottom_banner.jpg" /></div>');