function getStylePropertyById(p_id,p_prop) {
    if (document.getElementById) {
        var oS = document.getElementById( p_id );
        if (oS != null) {
            oS = oS.style;
            if (oS[p_prop]) return oS[ p_prop ];
        }
        oS = getStyleBySelector( "#" + p_id );
        return (oS != null) ? oS[p_prop] : null;
    } else if (document.all) {
        return document.all[p_id].style[p_prop];
    } else {
		return "";
	}
}
function setStylePropertyById(p_id,p_prop,p_val) {
    if (document.getElementById) {
        var oS = document.getElementById(p_id);
        if (oS != null) {
            oS = oS.style;
            oS[p_prop] = p_val;
        }
    } else if (document.all) {
		if (document.all[p_id] != null)	document.all[p_id].style[p_prop] = p_val;
    } else {} //so Nav4 won't return error
}
function toggleElementDisplay(p_el,p_style) {
	// p_style = (none,block,inline)
	var id;
	if (typeof p_el == "object") id = p_el.id;
	else if (typeof p_el == "string") id = p_el;
	if ((id != "") && (id != null)) {
		if (getStylePropertyById(id,'display')=='none') setStylePropertyById(id,'display',p_style);
		else setStylePropertyById(id,'display','none');
	}
}