function change_style(target, mode)
{
	if(mode == "change")
	{
		document.getElementById(target).style.backgroundImage = "url(img/small_wall2.jpg)";
		document.getElementById(target + "t").style.backgroundColor = "#E6E300";
		document.getElementById(target + "s").style.color = "#000000";
	}
	else if(mode == "back")
	{
		document.getElementById(target).style.backgroundImage = "url(img/small_wall.jpg)";
		document.getElementById(target + "t").style.backgroundColor = "#000099";
		document.getElementById(target + "s").style.color = "#ffffff";
	}
}