效果说明：
    实现鼠标移入和移出对象时的，对象背景渐隐渐现的动态效果。

<SCRIPT language=JavaScript>
<!--
    function over(obj, col,idNum) {
        changeColor(obj, col);
    }
    function out(obj,idNum) {
        changeColor(obj, "#3B77AB");
    }
    function changeColor(obj, col) {
        obj.filters.blendTrans.apply();
        obj.style.backgroundColor= col;
        obj.filters.blendTrans.play();
    }
//-->
</SCRIPT>

<style>
    .login {
        width:100px;
        height:19px;
        background-color:#3B77AB;
        filter: blendTrans(duration=0.5);
    }
</style>

<div class="login" onMouseOver="over(this, '#EFF8E2',2)" onMouseOut="out(this,2)" >
    AAAAAAAAA
    AAAAAAAAA
    AAAAAAAAA
</div>