function giveBtn(){
		var btn = document.getElementById('give-btn');
		if(btn.className=='btn'){
			btn.className = 'btn_over';
		} else {
			btn.className = 'btn';
		}
	}
	PreImageBtnOver1 = new Image(130,39);
	PreImageBtnOver1.src = SITE_ROOT + "images/btn_over.png";
	PreImageBtnOver2 = new Image(130,39);
	PreImageBtnOver2.src = SITE_ROOT + "images/btn_over.gif";
	PreImageBtnOver3 = new Image(130,39);
	PreImageBtnOver3.src = SITE_ROOT + "images/btn_brown_over.png";
	PreImageBtnOver4 = new Image(130,39);
	PreImageBtnOver4.src = SITE_ROOT + "images/btn_brown.png";
	
	function emailBtn(){
		var btn = document.getElementById('email-btn');
		if(btn.className=='btn_brown'){
			btn.className = 'btn_brown_over';
		} else {
			btn.className = 'btn_brown';
		}	
	}