var ns4;
var op5;
var op6;
var agt;
var mac;
var ie; 
var mac_ie;

function sniffBrowsers() {
	ns4 = document.layers;
	op5 = (navigator.userAgent.indexOf("Opera 5")!=-1) ||(navigator.userAgent.indexOf("Opera/5")!=-1);
	op6 = (navigator.userAgent.indexOf("Opera 6")!=-1) ||(navigator.userAgent.indexOf("Opera/6")!=-1);
	agt=navigator.userAgent.toLowerCase();
	mac = (agt.indexOf("mac")!=-1);
	ie = (agt.indexOf("msie") != -1); 
	mac_ie = mac && ie;
}

function getStyleObject(objectId, doc) {
    if(document.getElementById && document.getElementById(objectId)) {
	return document.getElementById(objectId).style;
    } else if (document.all && document.all(objectId)) {
	return document.all(objectId).style;
    } else if (document.layers && document.layers[objectId]) {
		return getObjNN4(document,objectId);
    } else {
	return false;
    }
} 

function changeObjectVisibility(objectId, newVisibility) {
    var styleObject = getStyleObject(objectId, document);
    if(styleObject) {
		styleObject.visibility = newVisibility;
		return true;
    } else {
		return false;
    }
} 


function changeDiv(divid,chked){

	// create object of all div tags in the document
	var tag = document.getElementsByTagName("DIV");
//	value.value = "";
	//alert("test");
	//alert(tag.length);
	for(x=0; x<tag.length; x++){
		if(tag[x].getAttribute("nav")){
			if (chked.checked){
				if(tag[x].id == chked.value){
					tag[x].style.display="block";
				}
			}else{
				if(tag[x].id == chked.value){
					tag[x].style.display="none";
				}
			}
		}
	}
	//alert(chked.value);
	if (chked.checked){
		changeChk(chked.value);
	}else{
		changeChkOff(chked.value);
	}
}

function changeDivChild(divid,chked){

	// create object of all div tags in the document
	var tag = document.getElementsByTagName("DIV");
	//alert(divid);

//	value.value = "";
	//alert("test");
	//alert(tag.length);
	for(x=0; x<tag.length; x++){
		
		if(tag[x].getAttribute("nav")){
			if (chked.checked){
				if(tag[x].id == chked.value){
					tag[x].style.display="block";
				}
			}else{
				if(tag[x].id == chked.value){
					tag[x].style.display="none";
				}
			}
		}
		
	}
	return;
}

function changeChk(divid){

	// create object of all div tags in the document
	var tag = document.getElementsByTagName("INPUT");
//	value.value = "";
	//alert("test");
	//alert(tag.length);
	for(x=0; x<tag.length; x++){
		if(tag[x].getAttribute("chkparent")==divid){
			tag[x].checked=true;
		}
	}
	//alert (divid.id);
	return;
}

function changeChkOff(divid){

	// create object of all div tags in the document
	var tag = document.getElementsByTagName("INPUT");
//	value.value = "";
	//alert("test");
	//alert(tag.length);
	for(x=0; x<tag.length; x++){
		if(tag[x].getAttribute("chkparent")==divid){
			tag[x].checked=false;
		}
	}
	//alert (divid.id);
	return;
}