var pagenum = 3;
var itemnum = 13;


function showPage(pageno)
{
highlightLink(pageno);
currpage = pageno;
for (var y = 1; y <= pagenum; y++)
   {
	document.getElementById("page" + y).style.display = "none";
   }
document.getElementById("page" + pageno).style.display = "block";


}

function nextPage()
{
	if(currpage < pagenum)
	{
	currpage = currpage + 1;
    showPage(currpage);
	}

}

function prevPage()
{
	if(currpage != 1)
	{
	currpage = currpage - 1;
    showPage(currpage);
	}

}

function showSeries(seriesno)
{
	
for (var y = 1; y <= itemnum; y++)
   {
	document.getElementById("series" + y).style.display = "none";
   }
document.getElementById("preContent").style.display = "none";
document.getElementById("series" + seriesno).style.display = "block";

}

function highlightLink(tab)
{
	for (var y = 1; y <= pagenum; y++)
   {
	document.getElementById("pageItem" + y).style.fontWeight = "normal";
	document.getElementById("pageItem"+y).style.color  = "#64ADEA";
	document.getElementById("pageItemb" + y).style.fontWeight = "normal";
	document.getElementById("pageItemb"+y).style.color  = "#64ADEA";
   }
	document.getElementById("pageItem"+tab).style.fontWeight  = "normal";
	document.getElementById("pageItem"+tab).style.textDecoration  = "underline";
	document.getElementById("pageItem"+tab).style.color  = "#FFFFFF";
	document.getElementById("pageItemb"+tab).style.fontWeight  = "normal";
	document.getElementById("pageItemb"+tab).style.textDecoration  = "underline";
	document.getElementById("pageItemb"+tab).style.color  = "#FFFFFF";
}