function fadeBG()
{
	$('#new_bg'+fbg).fadeOut({ duration: 2000 });
	$('#new_bg'+fbg2).fadeIn({ duration: 2000 });
	
	fbg = (fbg == 3) ? 1 : fbg + 1;
	fbg2 = (fbg2 == 3) ? 1 : fbg2 + 1;
}

function startBG()
{
	if(screen.width <= 1024)
	{
		var sres = "1024";
		var swidth = "1024";
		var sheigth = "498";
	}
	else if(screen.width <= 1152)
	{
		var sres = "1152";
		var swidth = "1152";
		var sheigth = "560";
	}
	else if(screen.width <= 1280)
	{
		var sres = "1280";
		var swidth = "1280";
		var sheigth = "622";
	}
	else if(screen.width <= 1400)
	{
		var sres = "1400";
		var swidth = "1390";
		var sheigth = "676";
	}
	else
	{
		var sres = "1440";
		var swidth = "1440";
		var sheigth = "700";
	}
	
	for(var i = 1; i <= 3; i++)
	{
		document.getElementById('new_bg'+i).innerHTML = '<img src="imgs/main_bg'+i+'_'+sres+'.jpg" width="'+swidth+'" height="'+sheigth+'" />';
	}
	
	for(var j = 2; j <= 3; j++)
	{
		document.getElementById('new_bg'+j).style.display = 'none';
		document.getElementById('new_bg'+j).style.marginTop = '0px';
	}
	
	setInterval('fadeBG();', 5000);	
}

var fbg = 1;
var fbg2 = 2;
addEvent(window, 'load', startBG);

function addEvent(obj, evType, fn){ 
 if (obj.addEventListener){ 
   obj.addEventListener(evType, fn, false); 
   return true; 
 } else if (obj.attachEvent){ 
   var r = obj.attachEvent("on"+evType, fn); 
   return r; 
 } else { 
   return false; 
 } 
}