$(document).ready(function() {
    $("#formajoutrdv").bind("submit", function(){
        var bReturn = true;
 
        if ( jQuery.trim($("#HeureDeb").val()).length==0 ) {
            bReturn = false;
        }
 
        if ( jQuery.trim($("#HeureFin").val()).length==0 ) {
            bReturn = false;
        }
 
        return bReturn;
    });
});