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Switching Css Style Sheets With Javascript

02.03.2006
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        // switch css style sheets with javascript (changing font size)

//this part goes within the head tags
<link rel="stylesheet" type="text/css" href="standard.css" title="standard" />
<link rel="alternate stylesheet" type="text/css" href="medium.css" title="medium" />
<link rel="alternate stylesheet" type="text/css" href="large.css" title="large" />

<script src="fontsize.js" type="text/javascript" language="javascript"></script>

//this part goes where you want the links that the user will click on to show up (the script part should probably be on one line with no breaks

<td valign="top" id="adjustcell">
<script type="text/javascript">
if (document.getElementById){ document.getElementById('adjustcell').innerHTML = '<table width="100" cellspacing="0" cellpadding="0" border="0"><tr>

<td colspan="4" height="10"> </td></tr><tr><td width="25"> </td><td width="25"><a href="#" onclick="setActiveStyleSheet(\'default\'); return false;">normal text size</a></td>

<td width="25"><a href="#" onclick="setActiveStyleSheet(\'medium\'); return false;">medium text size</a></td>

<td width="25"><a href="#" onclick="setActiveStyleSheet(\'large\'); return false;">large text size</a></td>

</tr>
<tr><td width="100" align="right" colspan="4" style="color: #ffffff;">Adjust Text Size</td></tr></table>';}
</script>
</td>

//contents of fontsizeswitcher.js (some of this is to switch images if you are using images instead of text links.

// var graphics_path = "" ;
var graphics_init = 0 ;

function init_path()
	{
	graphics_path = document.getElementById("default").src ; // "graphics" ;

graphics_path = graphics_path.substring(0,graphics_path.lastIndexOf("/"));
graphics_path = graphics_path.substring(graphics_path.indexOf(".com/")+4);

	graphics_init = 1 ;
	}

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;
	  }
    }
  }
  pressButton(title);
}

function unpressButton(which) {
	if ( graphics_init == 0 )
		{ init_path() }
	document.getElementById(which).src = graphics_path + "/" + which + ".gif";
}

switchButtons = ["default", "medium", "large"];

function pressButton(which) {
	if ( graphics_init == 0 )
		{ init_path() }
	for (i = 0; i < switchButtons.length; i++) {
		if (which == switchButtons[i]) {
			document.getElementById(which).src = graphics_path + "/" + which + "_p.gif";
		} else {
			document.getElementById(switchButtons[i]).src = graphics_path + "/" + switchButtons[i] + ".gif";
		}
	}
	if (which == "null") {
		document.getElementById("default").src = graphics_path + "/default_p.gif";
	}
}

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

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;
}

window.onload = function(e) {
  if ( graphics_init == 0 )
    { init_path() }
  smallpressed = new Image();
  smallpressed.src=graphics_path + "/default_p.gif"
  medpressed = new Image();
  medpressed.src=graphics_path + "/medium_p.gif"
  largepressed = new Image();
  largepressed.src=graphics_path + "/large_p.gif"
  if (document.getElementById) {
    var cookie = readCookie("style");
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
    }
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}