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哪位大佬幫忙簡化一下代碼

? menu_li[0].onmouseover=function()
????? {startMove( under_line[0],{width:100});};
?
????? ?
????? menu_li[0].onmouseout=function()
????? {startMove( under_line[0],{width:0});};
?????
?????? menu_li[1].onmouseover=function()
????? {startMove( under_line[1],{width:100});};
?
????? ?
????? menu_li[1].onmouseout=function()
????? {startMove( under_line[1],{width:0});};
????? ?
??? menu_li[2].onmouseover=function()
????? {startMove( under_line[2],{width:100});};
?
????? ?
????? menu_li[2].onmouseout=function()
????? {startMove( under_line[2],{width:0});};
???? menu_li[3].onmouseover=function()
????? {startMove( under_line[3],{width:100});};
?
????? ?
????? menu_li[3].onmouseout=function()
????? {startMove( under_line[3],{width:0});};
??????? menu_li[4].onmouseover=function()
????? {startMove( under_line[4],{width:100});};
?
????? ?
????? menu_li[4].onmouseout=function()
????? {startMove( under_line[4],{width:0});};
????? ?