$(document).ready(function(){
	$("#trigshow1").hover(
	function () {
		$("#about").css({opacity:'0.6',display:'block'});
	    },
	function () {
	      $("#about").hide("fast");
	    }
	    );
	    
	$("#trigshow").hover(
	function () {
	      $("#psorts").css({'opacity':'0.6',display:'block','z-index':'3'});
	    },
	function () {
	      $("#psorts").hide("fast");
	    }
	    );

	$(".navisort").hover(
	function(){
		$(this).css({'backgroundColor':'#5db0cc'});
		},
	function(){
		$(this).css({'background-color':'#2e9db9'});
		}
		);
//change contact page's department' color		
	$("#department").change(
	function(){
		if($("#department option:selected").val()!="null")
		$(this).css({'backgroundColor':'white'});
		});
		
//check whether department has been choose		
	$("#sendbutton").click(
	function(){
		if($("#department option:selected").val()=="null")
		alert("请选择部门");
		else
		$("#form").submit();
		});
});