function resizeTextDown(obj) 
{
    var div = document.getElementById("ContentDiv");
    var size = div.className.match(/\d/);   
    if (size > 1) div.className ="ContentSize" + (size-1);
}

function resizeTextUp(obj) 
{
    var div = document.getElementById("ContentDiv");
    var size = div.className.match(/\d/);   
    if (size < 3) div.className ="ContentSize" + (size*1+1);
}