function checkAll(field)
{
    for (i = 0; i < field.length; i++)
	field[i].checked = true ;
}

function uncheckAll(field)
{
    for (i = 0; i < field.length; i++)
	field[i].checked = false ;
}

function chHtml(oId, oHtml)
{
    if (document.getElementById || document.all)
    {
        var obj = document.getElementById? document.getElementById(oId): document.all[oId];
        if (obj && typeof obj.innerHTML != "undefined") obj.innerHTML = oHtml;
    }
}