function changeMenu(obj){
	for(var i=1;i<7;i++){
		if(obj == i){
			document.getElementById("b"+i).className = "over";
			document.getElementById("small"+i).style.display = "block";
		}else{
			document.getElementById("b"+i).className = "";
			document.getElementById("small"+i).style.display = "none";
		}	
	}
}

function checklogin() {
	if (document.KeyWordform.KeyWord.value=="") {
		alert("请输入搜索关键字！");
		KeyWordform.KeyWord.focus();
		return false;
	}
}