function changeArrowImage()
    {
        var imgPath = new String();
        imgPath = document.getElementById("arrow").style.backgroundImage;
        
        if(imgPath == "url(../images/arrow.png)" || imgPath == "")
        {
            document.getElementById("arrow").style.backgroundImage = "url(../images/arrow_invert.png)";
        }
        else
        {
            document.getElementById("arrow").style.backgroundImage = "url(../images/arrow.png)";
        }
		
    }
	
	
	
	function changeArrowImageVietnam()
    {
        var imgPath = new String();
        imgPath = document.getElementById("arrow").style.backgroundImage;
        
        if(imgPath == "url(images/arrow.png)" || imgPath == "")
        {
            document.getElementById("arrow").style.backgroundImage = "url(images/arrow_invert.png)";
        }
        else
        {
            document.getElementById("arrow").style.backgroundImage = "url(images/arrow.png)";
        }
		
    }