如何把javascript事件放到css里面？？？？

css写法

<div style="width:expression(go());"></div>

程序控制

<SCRIPT>
window.onload=fnInit;
function fnInit(){
var iLen=oSheet.rows.length-1;
for(var i=1;i<iLen;i++){
var oRow=oSheet.rows[i];
var oCells=oRow.cells;
oCells(3).setExpression("innerText",
"fnGetValue(" + oRow.uniqueID + ")");
}
var oGrand=oSheet.rows(iLen).cells(1);
oGrand.setExpression("innerText","fnGetTotal()");
}
function fnGetTotal(){
var iValue=0;
var iLen=oSheet.rows.length-1;
for(var i=1;i<iLen;i++){
iValue+=parseFloat(oSheet.rows(i).cells(3).innerText);
}
return iValue;
}
function fnGetValue(oRow){
var oCells=oRow.cells;
var oPrice=oCells(2);
var oQuantity=oCells(1);
var sPrice;
var sQuantity;