function popupcentree(page,largeur,hauteur,options) {
    var top=(screen.height-hauteur)/2;
	var left=(screen.width-largeur)/2;
	window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}




var check = true;

function coche_checkbox()
{
    var checkbox_ary = document.form_reference.elements['tableau_reference[]'];
    
    if( checkbox_ary.length != null )
    {
        for( var i = 0; i < checkbox_ary.length; i++ )
        {
            checkbox_ary[i].checked = check;
        }
    }
    else
    {
        checkbox_ary.checked = check;
    }
    
    switch( check )
    {
        case false:
            check = true;
            break;
        
        case true:
            check = false;
            break;
    }
}