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.formSubirAnuncio input:focus:invalid,
.formSubirAnuncio textarea:focus:invalid
{
    background-image: url('../images/invalid.png');
    background-repeat: no-repeat;
    background-size: auto 18px;
    background-position: top  right 3px;
     
    

}

.formSubirAnuncio input:focus:valid ,
.formSubirAnuncio textarea:focus:valid 
{
    background-image: url('../images/valid.png');
    background-repeat: no-repeat;
    background-size: auto 18px;
    background-position: top  right 3px;
    
}