弹出DIV层的时候,把页面上的下拉列表全部隐藏.

 <script type="text/javascript" language="javascript">
function hideSelect()
{
    selectTags =document.getElementsByTagName("SELECT");
    for (a=0;a<selectTags.length;a++){
        selectTags[a].style.visibility="hidden";
    }
}
function showSelect()
{
    selectTags =document.getElementsByTagName("SELECT");
    for (a=0;a<selectTags.length;a++){
        selectTags[a].style.visibility="visible";
    }
}
</script>