// Revient à la taille normale //
function stepcss_fontSize(obj) {
  obj.style.fontSize="";

}

// Augmente //
function stepup_fontSize(obj) {
	if (obj.className=="txt_accessibility" 
		|| obj.className=="lien_menu" 
		|| obj.id=="txt_recherche" 
		|| obj.className=="txtsituation" 
		) return;

	var objSize=obj.style.fontSize;
 
	switch (objSize) {
		case "xx-small": obj.style.fontSize="x-small";	break;
		case "x-small" : obj.style.fontSize="small";	break;
		case "small"   : obj.style.fontSize="medium";	break;
		case "medium"  : obj.style.fontSize="large";	break;
		case "large"   : obj.style.fontSize="large"; 	break;	// sets magnification upper limit
		case "12px"    : obj.style.fontSize="14px";		break;
		case "14px"    : obj.style.fontSize="16px";		break;
		case "16px"    : obj.style.fontSize="18px";		break;
		case "18px"    : obj.style.fontSize="20px";		break;
		case "20px"    : obj.style.fontSize="20px";		break;  // sets magnification upper limit
		default        : obj.style.fontSize="14px";		break;
	}
}

// Diminue //
function stepdn_fontSize(obj) {
	if (obj.className=="txt_accessibility" 
		|| obj.className=="lien_menu" 
		|| obj.id=="txt_recherche" 
		|| obj.className=="txtsituation" 
		) return;

	var objSize=obj.style.fontSize;

	switch (objSize) {
		case "large"   : obj.style.fontSize="medium";	break;
		case "medium"  : obj.style.fontSize="small";	break;
		case "small"   : obj.style.fontSize="x-small";	break;
		case "x-small" : obj.style.fontSize="xx-small";	break;
		case "20px"    : obj.style.fontSize="18px";		break;
		case "18px"    : obj.style.fontSize="16px";		break;
		case "16px"    : obj.style.fontSize="14px";		break;
		case "14px"    : obj.style.fontSize="12px";		break;
	}
}

//
function step_fontSize(obj, step) {
  if (step=="up") {
    stepup_fontSize(obj);
  }
  else if (step=="dn") {
    stepdn_fontSize(obj);
  }
  else {
    stepcss_fontSize(obj);
  }
}

function txtsize(step) {
	var types=["p","li","td","a","h3","h2","h1","span"];
	
	for(var i in types){
		var type=types[i];
		var elements=document.getElementsByTagName(type);
		for(var j=0;j<elements.length;j++){
			var element=elements[j];
			step_fontSize(element,step);
		}
	}
}