实现Title Alt功能可以显示图片

<html>
<head>
  <script language="javascript">
var tipTimer;
function locateObject(n, d) { //v3.0
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=locateObject(n,d.layers[i].document); return x;
}

function hideTooltip(object)
{
if (document.all)
{
locateObject(object).style.visibility="hidden"
locateObject(object).style.left = 1;
locateObject(object).style.top = 1;
return false
}
else if (document.layers)
{
locateObject(object).visibility="hide"
locateObject(object).left = 1;
locateObject(object).top = 1;
return false
}
else
return true
}

function showTooltip(object,e, tipContent, backcolor, bordercolor, textcolor, displaytime)
{
window.clearTimeout(tipTimer)

if (document.all)
{
locateObject(object).style.top=document.body.scrollTop+event.clientY+20

locateObject(object).innerHTML='<table style="font-family: Verdana,Tahoma, Arial, Helvetica, sans-serif; font-size: 11px; border: '+bordercolor+'; border-style: solid; border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; background-color: '+backcolor+'" width="10" border="0" cellspacing="1" cellpadding="1"><tr><td nowrap><font style="font-family: Verdana,Tahoma, Arial, Helvetica, sans-serif; font-size: 11px; color: '+textcolor+'">'+unescape(tipContent)+'</font></td></tr></table> '

if ((e.x + locateObject(object).clientWidth) > (document.body.clientWidth + document.body.scrollLeft))
{
locateObject(object).style.left = (document.body.clientWidth + document.body.scrollLeft) - locateObject(object).clientWidth-10;
}
else
{
locateObject(object).style.left=document.body.scrollLeft+event.clientX
}
locateObject(object).style.visibility="visible"
tipTimer=window.setTimeout("hideTooltip('"+object+"')", displaytime);
return true;
}
else if (document.layers)
{
locateObject(object).document.write('<table width="10" border="0" cellspacing="1" cellpadding="1"><tr bgcolor="'+bordercolor+'"><td><table width="10" border="0" cellspacing="0" cellpadding="2"><tr bgcolor="'+backcolor+'"><td nowrap><font style="font-family: Verdana,Tahoma, Arial, Helvetica, sans-serif; font-size: 11px; color: '+textcolor+'">'+unescape(tipContent)+'</font></td></tr></table></td></tr></table>')
locateObject(object).document.close()
locateObject(object).top=e.y+20

if ((e.x + locateObject(object).clip.width) > (window.pageXOffset + window.innerWidth))
{
locateObject(object).left = window.innerWidth - locateObject(object).clip.width-10;
}
else
{
locateObject(object).left=e.x;
}
locateObject(object).visibility="show"
tipTimer=window.setTimeout("hideTooltip('"+object+"')", displaytime);
return true;
}
else
{
return true;
}
}
</script>
  </head>
  <body>
<div id="dHTMLToolTip" style="position: absolute; visibility: hidden; width:10; height: 10; z-index: 1000; left: 0; top: 0"></div>
<span onMouseOver="showTooltip('dHTMLToolTip',event, '文字提示信息部分<br>Jimbor Studio<img src = 1.jpg height=120>', '#fffff2','#000000','#000000','20000')" onMouseOut="hideTooltip('dHTMLToolTip')">点这里</span>
</body>
<html>

如下效果
 

点这里