function sm(){
	var epnm=form1.epnm.value;
	var zw=form1.zw.value;
	var num=form1.num.value;
	var address=form1.address.value;
	var xcsp=form1.xcsp.value;
	var xlyq=form1.xlyq.value;
	var link_man=form1.link_man.value;
	var link_phone=form1.link_phone.value;
	var link_email=form1.link_email.value;
	var mess;
	mess="";
	var which;
	which="";
	switch(true){
		case(epnm==""):
			mess="单位名称不能空！";
			which="epnm";
			break
		case(zw==""):
			mess="招聘职位不能空！";
			which="zw";
			break
		case(num==""):
			mess="招聘人数不能空！";
			which="num";
			break			
		case(address==""):
			mess="工作地点不能空！";
			which="address";
			break
		case(xcsp==""):
			mess="薪酬水平不能空！";
			which="xcsp";
			break	
		case(xlyq==""):
			mess="学历要求不能空！";
			which="xlyq";
			break			
		case(link_man==""):
			mess="联系人不能空！";
			which="link_man";
			break			
		case(link_phone==""):
			mess="联系电话不能空！";
			which="link_phone";
			break
		case(link_email==""):
			mess="联系EMail不能空！";
			which="link_email";
			break
		case(!checkmail(link_email)):
			mess="联系EMail格式不对！！";
			which="link_email";
			break
		}
	if(mess!=""){
		alert(mess);
		document.form1.all[which].focus();
		return false
		}
		else return true
	}
	function checkmail(mail){
	re=/(\w+@\w+\.\w+)(\.{0,1}\w*)(\.{0,1}\w*)/i;
	x=re.exec(mail);
	if(x==null)return false
	else return true
	}