var pixelArray =  new Array('0.6em','0.8em','1.0em','1.2em','1.4em');
var pixelArray1 =  new Array('0.93em','0.7em','0.56em','0.47em','0.4em');
var initSize = 2;

function fontSizer(inc) {
	if (!document.getElementById("contenu")) 
		return;
	var size = initSize;
		size += inc;
	if (size < 0 ) {
		size = 0;
	}
	if (size > 4 ) {
		size = 4;
	}
	initSize = size;
	document.getElementById("contenu").style.fontSize = pixelArray[size];
	document.getElementById("breadcrumb").style.fontSize = pixelArray1[size];
}