var activePage = 1;
var numPages;

function gotoPage(page) {
	activePage = page;
	var linkID;
	var blockID;
	
	if (page==1) document.getElementById("back").className = "nextInactive";
	else document.getElementById("back").className = "next";
	if (page==numPages) document.getElementById("next").className = "nextInactive";
	else document.getElementById("next").className = "next";
	
	for (var i=1; i<=numPages; i++) {
		linkID = "page" + i;
		blockID = "bt_" + i;
		if (i==page) {
			document.getElementById(linkID).className = "active";
			document.getElementById(blockID).style.display = "inline";
		}
		else {
			document.getElementById(linkID).className = "";
			document.getElementById(blockID).style.display = "none";
		}
	}

}



function navPage(navIndx) {
	activePage = activePage + navIndx;
	if (activePage < 1) activePage = 1;
	if (activePage > numPages) activePage = numPages;
	gotoPage(activePage);
}