function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
    }
	else expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
	  
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i <ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
	return null;
}
       
function switchid(id){	
  if (document.getElementById){
    obj = document.getElementById(id);
    if (obj.style.display == "none"){
      showdiv(id);
    } else {
      hidediv(id);
	}
  }
}

function hidediv(id) {
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
    createCookie(id,'none',7);
}

function showdiv(id) {
	//safe function to show an element with a specified id
		  
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'block';
		}
		else { // IE 4
			document.all.id.style.display = 'block';
		}
	}
    createCookie(id,'block',7);
}

function init_divs() {
	for (var i=0; i<document.getElementsByTagName("div").length; i++ ) {
		var id = document.getElementsByTagName("div")[i].id;
		var is_id_ok=id.indexOf('_');
		if (is_id_ok!=-1) {
			var state = readCookie(id);
			if (state) {
				document.getElementsByTagName("div")[i].style.display=state;
			}
			else {
				document.getElementsByTagName("div")[i].style.display="none";
			}
		}
	}
}
window.onload = function () {init_divs();}