var t;			
t = 1;
// Fonction qui permet de modifier la taille du texte
function changerTaille(modif) {
	t = t + modif;		
	if (navigator.appName == 'Microsoft Internet Explorer') {
		for (i=0; i< document.styleSheets[2].rules.length; i++) {
			var rule = document.styleSheets[2].rules[i];
			rule.style.fontSize = t + "em";
		}
	}
	else {
		for (i=1; i< document.styleSheets[2].cssRules.length; i++) {
			var rule = document.styleSheets[2].cssRules[i];
			rule.style.fontSize = t + "em";
		}
	}
}