#pz {     
    background-image: url(../images/pz_bag_en.jpg);     
}

input[type=submit]{
    background: url('../images/odeslat_en.png') no-repeat top left;
}
input[type=submit]:hover, #poptavka input[type=submit]:hover{
    background: url('../images/odeslat_en_h.png') no-repeat top left;
}
#poptavka input[type=submit]{
    background: url("../images/odeslat_en.png") no-repeat scroll left top transparent;
}