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                var currItem = listbox.options[currIndex];
                var prevItem = listbox.options[currIndex - 1];
                //alert(currItem);
                alert(prevItem.text);
                listbox.options[currIndex - 1].text = currItem.text;
                listbox.options[currIndex - 1].value = currItem.value;
                alert(prevItem.text);  //Á½´ÎalertÖµÊDz»Í¬µÄ
                listbox.options[currIndex].text = prevItem.text;
                listbox.options[currIndex].value = prevItem.value;


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String.prototype.HTMLEncode = function() {
var temp = document.createElement ("div");
(temp.textContent != null) ? (temp.textContent = this) : (temp.innerText = this);
var output = temp.innerHTML;
temp = null;
return output;
}
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