var zoom = 12;
function zoomIn(){
	if(zoom <= 16){
		zoom = zoom + 2;
		varMain = document.getElementById("conteudo");
		varShow = varMain.style.fontSize= zoom+"px";
		var thisChild = varMain.firstChild;
		while ( thisChild != varMain.lastChild ){
			if ( thisChild.nodeType == 1 ){
				thisChild.style.fontSize= zoom+"px";
			}
			thisChild = thisChild.nextSibling;
		}
	}
}
function zoomOut(){
	if(zoom >= 15){
		zoom = zoom - 2;
		varMain = document.getElementById("conteudo");
		varShow = varMain.style.fontSize= zoom+"px";
		var thisChild = varMain.firstChild;
		while ( thisChild != varMain.lastChild ){
			if ( thisChild.nodeType == 1 ){
				thisChild.style.fontSize= zoom+"px";
			}
			thisChild = thisChild.nextSibling;
		}
	}
}