page = new Array(3);
page[0] = "nt60";
page[1] = "nt61";
page[2] = "nt62";
i = 0;
cos = new Array(1.0,.988,.951,.891,.809,.707,.588,.454,.309,.156,0);
widths = new Array(11);
for (var j=0; j<=10; j++) {
	widths[j] = Math.round(cos[j]*612);
}
function turn(j)	{
	currentPage = document.getElementById(page[i]);
	if (j==0) {
		nextPage = document.getElementById(page[i+1]);
		currentPage.style.zIndex='2';
		nextPage.style.zIndex='1';
		nextPage.style.visibility="visible";
	}
	var newWidth = widths[j] + "px";
	currentPage.style.width=newWidth;
	if (j>9) {
		currentPage.style.visibility="hidden";
		currentPage.style.zIndex='1';
		i++;
		if (i>0) {
			leftArrow = document.getElementById("la");
			leftArrow.style.visibility="visible";
		}
		if (i>1) {
			rightArrow = document.getElementById("ra");
			rightArrow.style.visibility="hidden";
		}
	} else {
		j++;
		setTimeout("turn("+j+")",60);
	}
	return true;
}
function turnBack(j)	{
	currentPage = document.getElementById(page[i]);
	if (j==10) {
		nextPage = document.getElementById(page[i-1]);
		currentPage.style.zIndex='1';
		nextPage.style.zIndex='2';
		nextPage.style.visibility="visible";
	}
	var newWidth = widths[j] + "px";
	nextPage.style.width=newWidth;
	if (j==0) {
		currentPage.style.visibility="hidden";
		currentPage.style.zIndex='1';
		i--;
		if (i<1) {
			leftArrow = document.getElementById("la");
			leftArrow.style.visibility="hidden";
		}
		if (i<3) {
			rightArrow = document.getElementById("ra");
			rightArrow.style.visibility="visible";
		}
	} else {
		j--;
		setTimeout("turnBack("+j+")",60);
	}
	return true;
}