// JavaScript Document
var Home = 1;
var End = 5;
var OPB=false;
var uagent = window.navigator.userAgent.toLowerCase();
OPB=(uagent.indexOf('opera') != -1)?true:false;
ie = (document.all)&&(OPB==false);

function getPageNum()
{
	var sPath = window.location.pathname;
	while(sPath.match(/.*\\.*/))
		sPath = sPath.replace(/\\/,"/");
	var sPage = sPath.substring(sPath.lastIndexOf('/') + 1);
	return sPage.toLowerCase().replace(/page([0-9]*)\.html?/,"$1");
}

function hide()
{
	if (page_num == Home)
	{
		var elem = ie ? eval("btnHome") : document.getElementById("btnHome")
		elem.style.visibility = "hidden";
		elem.style.display = "none";
		var elem = ie ? eval("btnBack") : document.getElementById("btnBack")
		elem.style.visibility = "hidden";
		elem.style.display = "none";
	}
	if (page_num == End)
	{
		var elem = ie ? eval("btnNext") : document.getElementById("btnNext")
		elem.style.visibility = "hidden";
		elem.style.display = "none";
	}
}

function nav(elem)
{
	switch(elem.id.replace("btn","") )
	{
		case "Next" :
			var n = parseInt(page_num) + 1;
			window.location = "page"+n+".html";
			break;
		case "Back" :
			var n = page_num - 1;
			window.location = "page"+n+".html";
			break;
		case "Home" :
			window.location = "page"+Home+".html";
			break;
		case "Print" :
			window.print();
			break;
		default :
			break;
	}
}