<form action="chuli.asp" method="post" name="form1" onsubmit="javascript:return form1ChK()">
	顾客姓名<input name="gkxm" type="text"><br> 
	顾客电话<input name="gkdh" type="text"><br>
	顾客地址<input name="gkdz" type="text"><br>
	顾客类型<input name="gklx" type="text"><br>
			<input name="submit" type="submit"> 
</form> 
<script language="javascript"> 
	function form1ChK(){//函数不要和表单同名	 
		if (document.form1.gkxm.value==""){ 
			alert("请输入顾客姓名!") 
			document.form1.gkxm.focus() 
			return false 
		}else if(document.form1.gkdh.value==""){ 
			alert("请输入顾客电话!") 
			document.form1.gkdh.focus() 
			return false 
		}else if(document.form1.gkdz.value==""){ 
			alert("请输入地址！") 
			document.form1.gkdz.focus() 
			return false 
		}else if(document.form1.gklx.value==""){ 
			alert("顾客类型不能为空！") 
			document.form1.gklx.focus()
			return false 
		} 
	}
</script>