function getObject(ID) {
	if (document.getElementById(ID)) {
		return document.getElementById(ID);
	} else if(document.all) {
		return document.all[ID];
	} else if(document.layers) {
		return document.layers[ID];
	}
}

function checklogin(){
	var regusername=getObject("regusername").value;
	var password=getObject("password").value;
	if (regusername==""){
		alert("请输入用户名");
		getObject("regusername").focus();
		return false;
	}
	else if (password==""){
		alert("请输入密码");
		getObject("password").focus();
		return false;
	}
	else{
		return true;
	}
}