function imgMinimizer(img){
    document.getElementById(img).style.height = '50px';
    document.getElementById(img).style.width = '50px';
    document.getElementById('label_'+img).style.display ='none';
}

function imgMaximizer(img){
    document.getElementById(img).style.height = '100px';
    document.getElementById(img).style.width = '100px';
    document.getElementById('label_'+img).style.display ='block';
}

/*EXEMPLE :
 *
   <a href="#" onmouseover="imgMaximizer('selectomat')" onmouseout="imgMinimizer('selectomat')">
    <img id="selectomat" style="width:50px;height:50px;" src="image/selectomat.gif" alt="selectomat"/>
   </a>
   <div id="label_selectomat" style="display:none" >Sterilisation</div>
   
 *
 **/