<!-- 跳转菜单：开始 -->
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}
<!-- 跳转菜单：结束 -->


<!-- 控制层显示隐藏：开始  ***符合各种浏览器*** -->
function changeMc1(a,b,c){
document.getElementById(a).style.display = "block"
document.getElementById(b).style.display = "none"
document.getElementById(c).style.display = "none"
}
<!-- 控制层显示隐藏：结束 -->