$.fn.fontSizeListener = function(option)
{	
    /* option */
    option = jQuery.extend({
        element: '#main-menu',
        callFunction : function(){}
    }, option);
    
    /* function */
    function fontSizeListener()
    {
    	this.el = 0;
    	this.h = 0;
    	this.listen = function()
    	{    			
    		this.el = $(''+ option.element +'')[0];
    		if(this.el.offsetHeight != this.h){
    			this.h = parseInt(this.el.offsetHeight);
    			option.callFunction();					
    		}
    		//
    	};
    	
    	this.fontSizeInterval = setInterval(this.listen, 200);			
     };
     new fontSizeListener();
};