function Obj_SetOpacity( obj_, opa_){
//-- Recup l'objet
var Obj = ( typeof (obj_)=='object') ? obj_ : document.getElementById( obj_);
//-- Si existe
if( Obj){
if(document.all && !window.opera){
Obj.style.filter = "alpha(opacity=" + opa_ + ");"
}
else{
var Val = opa_/100;
Obj.style.setProperty( "-moz-opacity", Val, "");
Obj.style.setProperty( "-khtml-opacity", Val, "");
Obj.style.setProperty( "opacity", Val, "");
}
}
}