Dynamic font size / font family possibility

Would it be possible to have dynamic font size / family where the user select it's prefered size and family while this preference will be used throughout the entire site.

I know it can (partially) as i have one that uses Javascript and cookies to store the users preference.
But what i can't get to work is having the cookie store both the prefered size and font family.

Javascript code:

<script type="text/javascript" language="JavaScript1.2">
path='/';
function SetCookie (value) { 
  expires = new Date();
  expires.setTime(expires.getTime() + 50000);
  document.cookie = "stylesheet=" + escape (value) + "; expires=" + expires.toGMTString() +"; path=" +path;
  location.reload();
}
function DeleteCookie () {
 expired = new Date();
 expired.setTime (expired.getTime() - 1);
 document.cookie = "stylesheet=" + "; expires=" + expired.toGMTString() +"; path=" +path;
 location.reload();
}
</script>
<script language="javascript1.2" src="css/selector.js"></script>

<script>
 function doSel(obj)
 {
     for (i = 1; i < obj.length; i++)
        if (obj[i].selected == true)
           eval(obj[i].value);
}
</script>

Body code:

				<form>
				<p class="control_block"><strong>LetterGrootte:</strong></p>
				<select name="jsSelList"  onclick="doSel(this)" style="width:140px; margin:10px;">
				<option value="DeleteCookie('')"></option>
				<option value="SetCookie('css/fontSize01')">Normal</option>
				<option value="SetCookie('css/fontSize02')">Large</option>
				<option value="SetCookie('css/fontSize03')">Extra Large</option>
				</select>
				<p class="control_block"><strong>LetterType:</strong></p>
				<select name="jsSelList" onclick="doSel(this)" style="width:140px; margin:10px;">
				<option value="SetCookie('css/fontType01')">Arial</option>
				<option value="SetCookie('css/fontType02')">Times</option>
				<option value="SetCookie('css/fontType03')">Verdana</option>
				</select>
				</form>

The fontSize01 - fontSize03 are 3 seperate .css files
to define what text want to resize and how big ( in percentages)

and fontType01 - fontType03 are 3 seperate .css files
which defines the family.

But how in the world can i store 2 prefered variables ?

With 2 cookies ?

Big thank you in advance..