function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		a_plus_over = newImage("images/a_plus-over.gif");
		a_minus_over = newImage("images/a_minus-over.gif");
		text_size_a_plus_over = newImage("images/text_size-a_plus_over.gif");
		preloadFlag = true;
	}
}
var min=8;
var max=28;
function increaseFontSize() 
{
   var p = document.getElementsByTagName('span');
   for(i=0;i<p.length;i++) 
   {
      if(p[i].style.fontSize) 
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      else 
         var s = 12;
      if(s!=max) 
         s += 1;
      p[i].style.fontSize = s+"px"
   }
   var h = document.getElementsByTagName('h2');
   for(i=0;i<h.length;i++) 
   {
      if(h[i].style.fontSize) 
         var s = parseInt(h[i].style.fontSize.replace("px",""));
      else 
         var s = 12;
      if(s!=max) 
         s += 1;
      h[i].style.fontSize = s+"px"
   }
}
function decreaseFontSize() 
{
   var p = document.getElementsByTagName('span');
   for(i=0;i<p.length;i++) 
   {
      if(p[i].style.fontSize)
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      else 
         var s = 12;
      if(s!=min) 
         s -= 1;
      p[i].style.fontSize = s+"px"
   }
   var h = document.getElementsByTagName('h2');
   for(i=0;i<h.length;i++) 
   {
      if(h[i].style.fontSize)
         var s = parseInt(h[i].style.fontSize.replace("px",""));
      else 
         var s = 12;
      if(s!=min) 
         s -= 1;
      h[i].style.fontSize = s+"px"
   }
}