/* 
	resize-content.js 
	Revised: 12/19/2007
	Written by: Mark Flint - Perficient, Inc.
	
	Assumes the base.jsp has style sheets defined similar to the following:
		<link rel="stylesheet" type="text/css" href="/graphics/css/usg.css"  media="screen" title="normal"/>
		<link rel="alternate stylesheet" type="text/css" href="/graphics/css/usg_larger.css"  media="screen" title="larger"/>
		<link rel="alternate stylesheet" type="text/css" href="/graphics/css/usg_largest.css"  media="screen" title="largest"/>
	Uses the title attribute to figure out which style sheet to activate.
*/

function text(size, obj) {
	for(i = 1; i < 4; i++)		// reset all three of the indicators size1, size2 and size3 to default off color.
	{
		document.getElementById('size' + i).style.fontWeight = 'normal';
	}
	obj.style.fontWeight = 'bold';		// change the boldness of the selected indicator

	setActiveStyleSheet(size);
	createCookie("style", size, 365);
}

function setActiveStyleSheet(title) {
  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;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  return ("normal");
}

function createCookie(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=/";
}

function readCookie(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;
}

function applyTextSize() { 
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
 
  var sizeNum = 0;		

  switch (title) {
	case "normal":
		sizeNum = 3;
		break;
	case "larger":
		sizeNum = 2;
			break;
	case "largest":
		sizeNum = 1;
		break;
	default:
		sizeNum = 3;
	}
// In usg.css, usg_larger.css and usg_larger.css there are css IDs named size1, size2, size3 that are div objects in breadcrumb.jsp (and base.jsp)
// The next line finds the object in the dom and returns it.
	var obj = document.getElementById('size' + sizeNum);
	if (obj) {
		text(title, obj); 	// title is same as size in this case
	}
}