function setFontSize(value) {
	theStyle = null;
	if (value == "small") theStyle 	= "100%";
	if (value == "medium") theStyle = "120%";
	if (value == "large") theStyle 	= "140%";
	if (theStyle) {
	    medula_var=document.getElementsByTagName("span")
	    for (i=0; i<medula_var.length; i++){
			document.getElementsByTagName("span")[i].style.fontSize = theStyle;
		}
	
}
}
setFontSize('large');