//語法：prev(element)
//參數(shù)：element對象
//返回：對象在當前級別中是第幾個元素,從1開始
//<SPAN class=sep>2010-08-26 15:13:55</SPAN>
function prev(elem,cont) {
if(!cont){cont=1}
elem = elem.previousSibling;
if(elem){return prev(elem,(cont+1))}
return cont
}

prev($("ext-gen232"))