jQuery.preloadImages=function()
{for(var i=0;i<arguments.length;i++)
{jQuery("<img>").attr("src",arguments[i]);}}
jQuery.fn.center=function()
{this.css("position","absolute");this.css("top",((($(window).height()- this.outerHeight())/2)+ $(window).scrollTop())+"px");this.css("left",((($(window).width()- this.outerWidth())/2)+ $(window).scrollLeft())+"px");return this;}