.invitations1 a{float:left;width:140px;height:140px;background:url(img/impressions/invitations/1.png)}
.invitations1 a:hover{background:url(img/impressions/invitations/1_thumbs.png)}
.invitations2 a{float:left;width:140px;height:140px;background:url(img/impressions/invitations/2.png)}
.invitations2 a:hover{background:url(img/impressions/invitations/2_thumbs.png)}
.invitations3 a{float:left;width:140px;height:140px;background:url(img/impressions/invitations/3.png)}
.invitations3 a:hover{background:url(img/impressions/invitations/3_thumbs.png)}