var showed_tab = 0;
var channel_showed_tab = 0;
var channel_showed_tab2 = 0;
var channel_showed_tab3 = 0;
var tab_menu_left;
var chang_tab_count=0;
var __load_img_arr = new Array();
function load_src_by_img_arr()
{
	for(var k=0;k<__load_img_arr.length;k++)
	{
		__load_img_arr[k].src = __load_img_arr[k].getAttribute('load_src');
	}
}

function change_tab(tab_key)
{
	if(showed_tab!=tab_key){
		document.getElementById("tab_btn_"+showed_tab).className ="item";
		document.getElementById("tab_btn_"+showed_tab).parentNode.className ="item_border";
		document.getElementById("tab_btn_"+tab_key).className ="item_selected";
		document.getElementById("tab_btn_"+tab_key).parentNode.className ="item_border_selected";
		document.getElementById("tab_"+showed_tab).style.display = "none";
		document.getElementById("tab_"+tab_key).style.display = "block";
		showed_tab = tab_key;
		
		var img_obj_arr = document.getElementById("tab_"+tab_key).getElementsByTagName('img');
		__load_img_arr = new Array();
		for(var j=0;j<img_obj_arr.length;j++)
		{
			if(img_obj_arr[j].getAttribute('load_src') && img_obj_arr[j].src=='http://www.poco.cn/images/spacer.gif')
			{
				__load_img_arr[__load_img_arr.length] = img_obj_arr[j]
			}
		}

		if(__load_img_arr.length > 0) setTimeout('load_src_by_img_arr()',1);		
		
	}else{
		return;
	}
	//document.getElementById("tab_menu").style.left = tab_menu_left;
}
function channel_change_tab(tab_key)
{
	if(channel_showed_tab!=tab_key){
		document.getElementById("channel_tab_btn_"+channel_showed_tab).className ="channel_item";
		document.getElementById("channel_tab_btn_"+channel_showed_tab).parentNode.className ="channel_item_border";
		document.getElementById("channel_tab_btn_"+tab_key).className ="channel_item_selected";
		document.getElementById("channel_tab_btn_"+tab_key).parentNode.className ="channel_item_border_selected";
		document.getElementById("channel_tab_"+channel_showed_tab).style.display = "none";
		document.getElementById("channel_tab_"+tab_key).style.display = "block";
		channel_showed_tab = tab_key;
		
		var img_obj_arr = document.getElementById("channel_tab_"+tab_key).getElementsByTagName('img');
		__load_img_arr = new Array();
		for(var j=0;j<img_obj_arr.length;j++)
		{
			if(img_obj_arr[j].getAttribute('load_src') && img_obj_arr[j].src=='http://www.poco.cn/images/spacer.gif')
			{
				__load_img_arr[__load_img_arr.length] = img_obj_arr[j]
			}
		}

		if(__load_img_arr.length > 0) setTimeout('load_src_by_img_arr()',1);		
		
	}else{
		return;
	}
	/*document.getElementById("tab_menu").style.left = tab_menu_left;*/
}

function channel_change_tab2(tab_key)
{
//alert(tab_key);
	if(channel_showed_tab2!=tab_key){
		document.getElementById("channel_tab_btn2_"+channel_showed_tab2).className ="channel_item2";
		document.getElementById("channel_tab_btn2_"+channel_showed_tab2).parentNode.className ="channel_item_border2";
		document.getElementById("channel_tab_btn2_"+tab_key).className ="channel_item_selected2";
		document.getElementById("channel_tab_btn2_"+tab_key).parentNode.className ="channel_item_border_selected2";
		document.getElementById("channel_tab2_"+channel_showed_tab2).style.display = "none";
		document.getElementById("channel_tab2_"+tab_key).style.display = "block";
		channel_showed_tab2 = tab_key;
		
		var img_obj_arr = document.getElementById("channel_tab2_"+tab_key).getElementsByTagName('img');
		__load_img_arr = new Array();
		for(var j=0;j<img_obj_arr.length;j++)
		{
			if(img_obj_arr[j].getAttribute('load_src') && img_obj_arr[j].src=='http://www.poco.cn/images/spacer.gif')
			{
				__load_img_arr[__load_img_arr.length] = img_obj_arr[j]
			}
		}

		if(__load_img_arr.length > 0) setTimeout('load_src_by_img_arr()',1);		
		
	}else{
		return;
	}
	/*document.getElementById("tab_menu").style.left = tab_menu_left;*/
}

function channel_change_tab3(tab_key)
{
//alert(tab_key);
	if(channel_showed_tab3!=tab_key){
		document.getElementById("channel_tab_btn3_"+channel_showed_tab3).className ="channel_item3";
		document.getElementById("channel_tab_btn3_"+channel_showed_tab3).parentNode.className ="channel_item_border3";
		document.getElementById("channel_tab_btn3_"+tab_key).className ="channel_item_selected3";
		document.getElementById("channel_tab_btn3_"+tab_key).parentNode.className ="channel_item_border_selected3";
		document.getElementById("channel_tab3_"+channel_showed_tab3).style.display = "none";
		document.getElementById("channel_tab3_"+tab_key).style.display = "block";
		channel_showed_tab3 = tab_key;

		var img_obj_arr = document.getElementById("channel_tab3_"+tab_key).getElementsByTagName('img');
		__load_img_arr = new Array();
		for(var j=0;j<img_obj_arr.length;j++)
		{
			if(img_obj_arr[j].getAttribute('load_src') && img_obj_arr[j].src=='http://www.poco.cn/images/spacer.gif')
			{
				__load_img_arr[__load_img_arr.length] = img_obj_arr[j]
			}
		}

		if(__load_img_arr.length > 0) setTimeout('load_src_by_img_arr()',1);		
		
	}else{
		return;
	}
	/*document.getElementById("tab_menu").style.left = tab_menu_left;*/
}