#main{height:750px;width:900px;
background-image: url(wall.png);
margin: 0 auto;}

#menu{wdth:150px;float:left;margin:100px 0px 0px 50px}

a.hello{background-image:url(hello.png);display:block;width:150px;height:65px;}
.hello:hover{background-position:left bottom;}


a.blog{background-image:url(blog.png);display:block;width:150px;height:65px;}
.blog:hover{background-position:left bottom;}


a.twitter{background-image:url(twitter.png);display:block;width:150px;height:65px;}
.twitter:hover{background-position:left bottom;}

a.mail{background-image:url(mail.png);display:block;width:150px;height:65px;}
.mail:hover{background-position:left bottom;}



div.footer{
    height:50px;width:900px
      display:table-cell;
    vertical-align:middle;
    text-align:center;
}