(function($) {
$.fn.background = function(){
                         var xScroll, yScroll;
                        if (window.innerHeight && window.scrollMaxY) {
                                xScroll = window.innerWidth + window.scrollMaxX;
                                yScroll = window.innerHeight + window.scrollMaxY;
                        } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
                                xScroll = document.body.scrollWidth;
                                yScroll = document.body.scrollHeight;
                        } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                                xScroll = document.body.offsetWidth;
                                yScroll = document.body.offsetHeight;
                        }
                        var windowWidth, windowHeight;
                        if (self.innerHeight) {        // all except Explorer
                                if(document.documentElement.clientWidth){
                                        windowWidth = document.documentElement.clientWidth;
                                } else {
                                        windowWidth = self.innerWidth;
                                }
                                windowHeight = self.innerHeight;
                        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
                                windowWidth = document.documentElement.clientWidth;
                                windowHeight = document.documentElement.clientHeight;
                        } else if (document.body) { // other Explorers
                                windowWidth = document.body.clientWidth;
                                windowHeight = document.body.clientHeight;
                        }
                        // for small pages with total height less then height of the viewport
                        if(yScroll < windowHeight){
                                var pageHeight = windowHeight;
                        } else {
                                var pageHeight = yScroll;
                        }
                        // for small pages with total width less then width of the viewport
                        if(xScroll < windowWidth){
                                var pageWidth = xScroll;
                        } else {
                                var pageWidth = windowWidth;
                        }
                        arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);

                        if(arrayPageSize[3] < 700){
                         $(this).css('height',700);
                        } else {
                         $(this).css('height',arrayPageSize[3]);
                        }

                        return this;
                  };
})(jQuery)