var zoomFactor = 0;
var fontSizeGlobal = "100%";

function zoom()
{  
  zoomFactor=zoomFactor + 20;
  if (zoomFactor>40) zoomFactor = -20;

  // alert('zoomFactor: ' + zoomFactor);

  var factor = zoomFactor;
  var size = "100%";
  var obj = document.getElementById("content");

  if (obj) {
    if (obj.style.fontSize != null &&
        obj.style.fontSize != "")
      { size = obj.style.fontSize; }
    size = Number(String(size).substring(0, String(size).indexOf("%")))
    if (size > 20 && size < 400) size = size + factor;
    if (factor == 0) size = 100;

    setPersFontSize(size + "%");
    loadZoom();
    // if (navigator.appName=="Netscape") {location.reload();}
  } else {
    alert('The zoom function is only available on content pages.');
  }
}		

function loadZoom()
{
  var newSize = getPersFontSize();
  var obj = document.getElementById("content");
  obj.style.fontSize = newSize;
  
  /*
  var lineHeight = '18px';
  if (newSize=='120%') {
    lineHeight = '35px'; 
  } else if (newSize=='140%') {
    lineHeight = '50px';
  } else if (newSize=='160%') {
    lineHeight = '60px'; 
  }
  */
 
  // obj.style.lineHeight = lineHeight;

  var obj = document.getElementById("content_table");
  if (obj) {
    obj.style.fontSize = newSize;
    // obj.style.lineHeight = lineHeight;
    // alert(obj.style.lineHeight );
  }
  // changeP(newSize);
}

// http://www.quirksmode.org/dom/changess.html
function changeP(newSize) {
	if (!document.styleSheets) return;
	var theRules = new Array();
	if (document.styleSheets[1].cssRules) theRules = document.styleSheets[1].cssRules
	else if (document.styleSheets[1].rules)
	theRules = document.styleSheets[1].rules
	else return;
	//theRules[theRules.length-1].style.p.fontSize = newSize;
        theRules[theRules.length-1].style.backgroundColor = '#EEF0F5';
}

function setPersFontSize(fontSize)
{
    document.cookie = "fontSize=" + fontSize + ";";
    fontSizeGlobal = fontSize;
}


function getPersFontSize()
{
  var fontSize = "100%";
	
  if (document.cookie) 
  {
	  var val = document.cookie;
	  var idxStart = val.indexOf("fontSize=")
	  var idxEnd = val.indexOf(";", idxStart);

	  if (idxEnd < 0) { idxEnd = val.length; }
          if (idxStart >= 0) {fontSize = val.substring(idxStart + "fontSize=".length, idxEnd);}  
  } 
  else 
  {
    fontSize = fontSizeGlobal;
    setPersFontSize(fontSize);
  }

  if (fontSize=="180%") fontSize="100%";
  
  return fontSize;
}