function TextSize(percent){
	
	if(document.getElementById("contenidoprincipal").style.fontSize == ""){
		document.getElementById("contenidoprincipal").style.fontSize = "100%";
	}
	var numpercent = document.getElementById("contenidoprincipal").style.fontSize.substring(0,3);
	if((percent + parseInt(numpercent)) <= 140 && (percent + parseInt(numpercent)) >= 100) {
		document.getElementById("contenidoprincipal").style.fontSize = (percent + parseInt(numpercent)) + '%';
	}
}