//打开窗口
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

//跳转菜单
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}

//下拉菜单
var tt='start';
var ii='start';
function turnit(ss,bb) {
  if (ss.style.display=="none") {
    if(tt!='start') tt.style.display="none";
    if(ii!='start') ii.src="";
    ss.style.display="";
    tt=ss;
    ii=bb;
    bb.src="";
  }
  else {
    ss.style.display="none"; 
    bb.src="";
  }
}