function setpos(){
    windowheight=$(window).height();
    contentheight=$("#thecontent").height();
    posnum=windowheight/2-contentheight/2+120;
    $("#thecontent").css({'margin-top':posnum});
    contactposnum=windowheight/2-contentheight/2-295;
    $("#thecontentcontact").css({'margin-top':contactposnum});
    $("#thecontentvideo").css({'margin-top':contactposnum});
    $(".maincontent").css({'height':windowheight});
    homeposnum=posnum-279;
    contactposnum=posnum-413;
    videoposnum=posnum-398;
    $("#maincontenthome").css({'background-position':'0px '+homeposnum+'px'});
    $("#maincontentcontact").css({'background-position':'0px '+contactposnum+'px'});
    $("#maincontentvideo").css({'background-position':'0px '+videoposnum+'px'});

}