// JavaScript Document
/********************************************************************
主题:dianlihu.com首页脚本
作者:Issac
日期:Dec.2005
********************************************************************/
function trim(inputString) {
	return inputString.replace(/^ +/,"").replace(/ +$/,"");
}
/***********************/
function changeSearch(a) {
	//基本参数
	var actionArray = ["../search/buylist.aspx","../search/selllist.aspx","../search/companylist.aspx","../search/newslist.aspx","../search/techlist.aspx","../search/downlist.aspx","/search/showlist.aspx","../search/postlist.aspx"];
	var textArray = ["请输入供应信息关键字!","请输入求购信息关键字!","请输入公司信息关键字!","请输入资讯信息关键字!","请输入专业问题的关键字!","请输入资料名称关键字!","请输入展会名称关键字!","请输入贴子名称关键字!"];
	var buttonArray = ["搜　索","搜　索","搜　索","搜　索","搜　索","搜　索","搜　索","搜　索"];
	var oTag = document.getElementById("sTag").getElementsByTagName("li");
	var oTagA = document.getElementById("sTag").getElementsByTagName("a");
	var oForm = document.getElementById("sForm");
	var oField = document.getElementById("sText");
	var oButton = document.getElementById("sButton");

	whichType();	//初始化	//事件行为
	for (var i=0; i<oTag.length; i++)
		oTag[i].onclick = function() {whichType (this);}
	for (var i=0; i<oTagA.length; i++)
		oTagA[i].onfocus = function() {this.blur();}
	oField.onfocus = function() {
		this.value = "";
		this.style.color = "#333";
	}
	//内部函数
	function whichType (o) {
		var _o = o || oTag[a];
		for (var i=0; i<oTag.length; i++)
			oTag[i].className = "ntab";
		_o.className = "activedtab";
	
		for (var i=0; i<oTag.length; i++)
			if (oTag[i].className == "activedtab") {
				var v = document.getElementById("sText").value;					
				if(trim(v) == "" || v.substring(0,3) =="请输入") oField.value  = textArray[i];
				oField.style.color = "#999"; 
				//oField.value = textArray[i];
				oButton.value = buttonArray[i];
				oForm.action = actionArray[i];
				//oForm.onsubmit=function() {return false;}
				//oForm.method="POST";
				
			}
	}
	oButton.onclick = function() {return CheckSub();}
	function CheckSub(){
	    var v = document.getElementById("sText").value;
	    if(trim(v) == "" || v.substring(0,3) =="请输入"){
	    return false;
	    }
	    else
	    {
	        //window.location.href=document.getElementById("sForm").action+"?keywords="+document.getElementById("sText").value; 
	        var theForm = document.getElementById("sForm");
	        theForm.submit();
	        return true;
	    }
	}
}