var isResized = false;
function resizeText()
{
    if(!isResized)
    {   
        var currentFS = $('html').css('font-size');
        var currentFontSizeNum = parseFloat(currentFS, 10);
        var newFS = currentFontSizeNum*1.3;
        $('html').css('font-size', newFS);
        isResized = true;
    } 
    else
    {
       $('html').css('font-size',standardFS); 
       isResized = false
    }   
       
}

var standardFS = "";
$(document).ready(function(){
    standardFS = $('html').css('font-size');
})