var font_resize = {
	min: 12,
	max: 18,
	mod: 1,
	diminuir: function(objid){
		var els = document.getElementById(objid).getElementsByTagName("*"), fs;
		for(i=0;i<els.length;i=i+1){
			if (els[i].currentStyle){
				fs = els[i].currentStyle.fontSize;
			}else if (window.getComputedStyle){
				fs = document.defaultView.getComputedStyle(els[i],null).fontSize;
			}
			if(fs){
				fs = parseInt(fs.replace(/\D/gi,""));
				if(fs > this.min){
					els[i].style.fontSize = fs - this.mod + "px";
				}
			}
		}
	},
	aumentar: function(objid){
		var els = document.getElementById(objid).getElementsByTagName("*"), fs;
		for(i=0;i<els.length;i=i+1){
			if (els[i].currentStyle){
				fs = els[i].currentStyle.fontSize;
			}else if (window.getComputedStyle){
				fs = document.defaultView.getComputedStyle(els[i],null).fontSize;
			}
			if(fs){
				fs = parseInt(fs.replace(/\D/gi,""));
				if(fs < this.max){
					els[i].style.fontSize = fs + this.mod + "px";
				}
			}
		}
	}
}