新人请教，请高人指点，谢谢！

如下表达式错在哪里，谢谢！

(thisform.combo3.value>y) or ((thisform.combo3.value=y) and (thisform.combo4.value>m)) or (thisform.combo5.value>y) or ((thisform.combo5.value=y) and (thisform.combo6.value>m))