String.prototype.isNaN = function() { var re = new RegExp("^[1-9]+([0-9]*)$|^0$","ig"); return re.test(this); }
function _do_header_search(method, actionURL, contentType) {
	document.getElementById("method").value = method;
	if(contentType){
		document.getElementById("contentType").value = contentType;
		var num = document.getElementById("keyWord").value;
		if(!num.isNaN()){
			if(num.substr(0,1) == "0"){
				alert("牛奶号不能以0开头，请输入正确的牛奶号！");
			}else{
				alert("牛奶号应为全数字，请输入正确的牛奶号！");
			}
			return false;
		}
	}
	document.getElementById("headersearchform").submit();
}