// JavaScript Document
initPage = function() {
	if(document.getElementById && document.createTextNode) {
		// attach events to font-controls
		a = document.getElementById("font-smaller");
		if(a) {
			a.onclick = function() {reduceFontSize(); this.blur(); return false};
			a.onkeypress = function() {reduceFontSize(); return false};
		}
		a = document.getElementById("font-larger");
		if(a) {
			a.onclick = function() {increaseFontSize(); this.blur(); return false};
			a.onkeypress = function() {increaseFontSize(); return false};
		}
	}
}
function setActiveStyleSheet(title) {
  if(document.getElementById && document.createTextNode) {
		var i, a, main;
	  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
	     	a.disabled = true;
	      if(a.getAttribute("title") == title) a.disabled = false;
	    }
	  }
	}
}

setStyles = function() {
  var cookie = readCookie("sizeStyles");
  var title = cookie ? cookie : "small";
	createCookie("sizeStyles", title, 365);
 	setActiveStyleSheet(title);
}

reduceFontSize = function() {
	var fs = readCookie("sizeStyles");
	switch(fs) {
		case "small":
			// do nothing
			break;
		case "medium":
			fs = "small";
			break;
		case "large":
			fs = "medium";
			break;
		case "x-large":
			fs = "large";
			break;
		default:
			fs = "small";
	}
	createCookie("sizeStyles", fs, 365);
	setActiveStyleSheet(fs);
}

increaseFontSize = function() {
	var fs = readCookie("sizeStyles");
	switch(fs) {
		case "small":
			fs = "medium";
			break;
		case "medium":
			fs = "large";
			break;
		case "large":
			fs = "x-large";
			break;
		case "x-large":
			// do nothing
			break;
		default:
			fs = "medium";
	}
	createCookie("sizeStyles", fs, 365);
	setActiveStyleSheet(fs);
}

createCookie = function(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

readCookie = function(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}