function sizeFont(nfont, elem){
	document.getElementById(elem).className = "font_size"+nfont;
	if(nfont==3){
		document.getElementById("ic_f"+nfont).src = "images/button/font_"+nfont+"_on.gif";
		document.getElementById("ic_f"+(nfont-1)).src = "images/button/font_"+(nfont-1)+"_off.gif";
		document.getElementById("ic_f"+(nfont-2)).src = "images/button/font_"+(nfont-2)+"_off.gif";					
	}
	if(nfont==2){
		document.getElementById("ic_f"+nfont).src = "images/button/font_"+nfont+"_on.gif";
		document.getElementById("ic_f"+(nfont-1)).src = "images/button/font_"+(nfont-1)+"_off.gif";
		document.getElementById("ic_f"+(nfont+1)).src = "images/button/font_"+(nfont+1)+"_off.gif";					
	}
	if(nfont==1){
		document.getElementById("ic_f"+nfont).src = "images/button/font_"+nfont+"_on.gif";
		document.getElementById("ic_f"+(nfont+1)).src = "images/button/font_"+(nfont+1)+"_off.gif";
		document.getElementById("ic_f"+(nfont+2)).src = "images/button/font_"+(nfont+2)+"_off.gif";					
	}
}