document.writeln('<div id="codefans_net2" style="position:absolute">');
document.writeln('<a href="http://dbn.com.cn/gonggao.jsp" target="_blank">');
document.writeln("<img src='' border='0' id='tp'>");
document.writeln('</a>');
document.writeln('</div>'); 



var x2 = 80,y2 = 200; 
var x2in = true, yin2 = true; 
var step2 = 1; 
var delay2 = 10; 
var obj2=document.getElementById("codefans_net2"); 

function float2() { 
	
	
		var L=T=100;  //和上边下边各差100px  因为这里的漂移有问题
		var R= document.body.clientWidth-obj2.offsetWidth;
		var B = document.body.clientHeight-obj2.offsetHeight; 
		obj2.style.left = x2 + document.body.scrollLeft; 
		obj2.style.top = y2 + document.body.scrollTop ;
		x2 = x2 + step2*(x2in?1:-1) ;
		if (x2 < L)
			{ x2in = true; x2 = L}
		if (x2 > R)
			{ x2in = false; x2 = R}
		y2 = y2 + step2*(yin2?1:-1); 
		if (y2 < T)
			{ yin2 = true; y2 = T } 
		if (y2 > B) 
			{ yin2 = false; y2 = B } 
} 

var itl2= setInterval("float2()", delay2); 
obj2.onmouseover=function(){clearInterval(itl2)} ;
obj2.onmouseout=function(){itl2=setInterval("float2()", delay2)};