var minimo=75;
var maximo=85;

function increaseFontSize() {
var s =  parseInt(document.getElementById('textovaria').style.fontSize.replace("%",""));
//alert (s);
      if(s!=maximo) {
         s = s+10;
      } else {
		 s = 85;
	  }
       document.getElementById('textovaria').style.fontSize = s+"%" 
	   window.name=s;
}

function decreaseFontSize() {
var s =  parseInt(document.getElementById('textovaria').style.fontSize.replace("%",""));
      if(s!=minimo) {
         s -= 10;
      } else {
		 s = 75;
	  }
       document.getElementById('textovaria').style.fontSize = s+"%" 
	   window.name=s;
}