【html】设置有滚动条的select

<select class='newsTypeList' onfocus="selectFocus(this)">  
<option onclick="selectClick(this)">1</option>  
</select>

window.selectFocus = function(that) {  
$(that).attr("size", 5);  
};  
window.selectClick = function(that) {  
$(that).parent().removeAttr("size");  
$(that).parent().blur();  
$(that).parent().children("[selected='selected']").removeAttr("selected");  
$(that).attr("selected", "");  
};