var isDHTML = 0;
var isID = 0;
var isAll = 0;
var isLayers = 0;


if (document.getElementById) {
	isID = 1;
	isDHTML = 1;
} else {
	if (document.all) {
		isAll = 1;
		isDHTML = 1;
	} else {
		browserVersion = parseInt(navigator.appVersion);
		if ((navigator.appName.indexOf('Netscape') != -1) && (browserVersion == 4)) {
			isLayers = 1;
			isDHTML = 1;
		}
	}
}

if (navigator.appVersion.indexOf('MSIE') != -1) {
	isIE = 1;
} else {
	isIE = 0;
}

function findDOM(objectID,withStyle) {
	if (withStyle == 1) {
		if (isID) {
			return (document.getElementById(objectID).style);
		} else {
			if (isAll) {
				return (document.all[objectID].style);
			} else {
				if (isLayers) {
					return (document.layers[objectID]);
				}
			}
		}
	} else {
		if (isID) {
			return (document.getElementById(objectID));
		} else {
			if (isAll) {
				return (document.all[objectID]);
			} else {
				if (isLayers) {
					return (document.layers[objectID]);
				}
			}
		}
	}
}

function hideClamShellMenu(objectID) {
	if (isAll || isID) {
		domStyle = findDOM(objectID,1);
		
		// hide the object
		domStyle.display='none';
		
	} else {
		destination = objectID + '.html';
		self.location = destination;
	}
	return;
}

function showClamShellMenu(objectID) {
	if (isAll || isID) {
		domStyle = findDOM(objectID,1);
		
		// show the object
		domStyle.display='block';
		
	} else {
		destination = objectID + '.html';
		self.location = destination;
	}
	return;
}

function showClamShellMenu_inline(objectID) {
	if (isAll || isID) {
		domStyle = findDOM(objectID,1);
		
		// show the object
		domStyle.display='inline';
		
	} else {
		destination = objectID + '.html';
		self.location = destination;
	}
	return;
}

function select_tab(tab) {
	showClamShellMenu_inline('section1_link');
	hideClamShellMenu('section1_title');
	showClamShellMenu_inline('section2_link');
	hideClamShellMenu('section2_title');
	showClamShellMenu_inline('section3_link');
	hideClamShellMenu('section3_title');
	
	if (tab == '1') {
		hideClamShellMenu('section1_link');
		showClamShellMenu_inline('section1_title');
	} else if (tab == '2') {
		hideClamShellMenu('section2_link');
		showClamShellMenu_inline('section2_title');
	} else if (tab == '3') {
		hideClamShellMenu('section3_link');
		showClamShellMenu_inline('section3_title');
	}
}