var browser = new function(){
    this.width = -1;
    this.height = -1;
    this.getDimensions = function(){
        if(typeof(window.innerWidth) != 'undefined'){
            browser.width = window.innerWidth
            browser.height = window.innerHeight
        }else{
            browser.width = document.documentElement.clientWidth;
            browser.height = document.documentElement.clientHeight;
        }
    }
}