css simulation implements select drop-down box_html/css_WEB-ITnose

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<script><br> var $$ = function (id) {<br> return document.getElementById(id);<br>}<br>window.onload = function () {<br> var btnSelect = $$("btn_select");<br> var curSelect = btnSelect.getElementsByTagName("span")[0];<br> var oSelect = btnSelect.getElementsByTagName("select")[0];<br> var aOption = btnSelect.getElementsByTagName("option");<br> oSelect.onchange = function () {<br> var text=oSelect.options[oSelect.selectedIndex].text;<br> curSelect.innerHTML = text;<br> }<br>}<br></script>