//焦点图片轮换
function $(id) { return document.getElementById(id); }

function addLoadEvent(func){
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function(){
			oldonload();
			func();
		}
	}
}

function addBtn() {
	if(!$('focus_turn')||!$('focus_pic')) return;
	var focusList = $('focus_pic').getElementsByTagName('li');
	if(!focusList||focusList.length==0) return;
	var btnBox = document.createElement('div');
	btnBox.setAttribute('id','focus_btn');
	var SpanBox ='';
	for(var i=1; i<=focusList.length; i++ ) {
		var spanList = '<span class="normal">'+i+'</span>';
		SpanBox += spanList;
	}
	btnBox.innerHTML = SpanBox;
	$('focus_turn').appendChild(btnBox);
	$('focus_btn').getElementsByTagName('span')[0].className = 'current';
}

function classNormal(){
	var focusList = $('focus_pic').getElementsByTagName('li');
	var btnList = $('focus_btn').getElementsByTagName('span');
	for(var i=0; i<focusList.length; i++) {
		focusList[i].className='normal';
		btnList[i].className='normal';
	}
}

function classCurrent(n){
	var focusList = $('focus_pic').getElementsByTagName('li');
	var btnList = $('focus_btn').getElementsByTagName('span');
	focusList[n].className='current';
	btnList[n].className='current';
}

var autoKey = false;
function btnTurn() {
	if(!$('focus_turn')||!$('focus_pic')) return;
	$('focus_turn').onmouseover = function(){autoKey = true};
	$('focus_turn').onmouseout = function(){autoKey = false};	
	var focusList = $('focus_pic').getElementsByTagName('li');
	var btnList = $('focus_btn').getElementsByTagName('span');
	for (var m=0; m<btnList.length; m++){
		btnList[m].onmouseover = function() {
			classNormal();
			this.className='current';
			var n=this.childNodes[0].nodeValue-1;
			focusList[n].className='current';
		}
	}
}

addLoadEvent(addBtn);
addLoadEvent(btnTurn);
addLoadEvent(setautoturn);

function setautoturn() {
	setInterval('autoTurn()', 3000);
}

function autoTurn() {
	if(!$('focus_turn')||!$('focus_pic')) return;
	if (autoKey) return;
	var focusList = $('focus_pic').getElementsByTagName('li');
	var btnList = $('focus_btn').getElementsByTagName('span');
	for(var i=0; i<focusList.length; i++) {
		if (focusList[i].className == 'current') {
			var currentNum = i;
		}
	}
	if (currentNum==focusList.length-1 ){
		classNormal();
		classCurrent(0);
	} else {
		classNormal();
		classCurrent(currentNum+1);
	}

}

function login() {
	var alertinput = "请输入:\n\n";
	var mesg = "";
	if(document.logon.username.value == "") mesg += "用户\n";
	if(document.logon.password.value == "") mesg += "密码\n";
	if(mesg != ""){
		mesg = alertinput + mesg;
		alert(mesg);
		return false;
	}	
	return true;
}


//二手选项卡
function toggleTo(i)
{
	switch(i)
	 {
	 case 1:
	 document.getElementById("tab1").style.display="block";
	 document.getElementById("tab2").style.display="none";
	 document.getElementById("img1").src="images09/qz1.gif";
	 document.getElementById("img2").src="images09/zp2.gif";
	 break;
	 case 2:
	 document.getElementById("tab1").style.display="none";
	 document.getElementById("tab2").style.display="block";
	 document.getElementById("img1").src="images09/qz2.gif";
	 document.getElementById("img2").src="images09/zp1.gif";
	 break;
	 case 3:
	 document.getElementById("tab3").style.display="block";
	 document.getElementById("tab4").style.display="none";
	 document.getElementById("img3").src="images09/cz1.gif";
	 document.getElementById("img4").src="images09/cs2.gif";
	 break;
	 case 4:
	 document.getElementById("tab3").style.display="none";
	 document.getElementById("tab4").style.display="block";
	 document.getElementById("img3").src="images09/cz2.gif";
	 document.getElementById("img4").src="images09/cs1.gif";
	 break;
	 }
}