/**for FF/Chrome**/
.fix{
position:fixed;
top:100px;
left:200px;
}
/**for IE8、7、6**/
.ie-fix{
_position:absolute;
_clear:both;
_top:expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop +(documentElement.clientHeight-this.clientHeight) - 1 : document.body.scrollTop +(document.body.clientHeight-this.clientHeight) - 1);
}