function byId(id) { 
	return document.getElementById(id); 
} 

function tagExists(tag) { 
	var tags = byId("tags"); 
	tags_list = tags.value; 
	tags_array = tags_list.split(" "); 

	tags_list = ""; 
	for (x in tags_array) { 
		if(tags_array[x] == tag) { 
			return true; 
		} 
	} 
	return false; 
} 

function addTag(tag) { 
	if (!tagExists(tag)) { 
		// append tag to tag box. 
		var tags = byId("tags"); 
		tags.value = tags.value +" "+ tag; 
	} 
} 

// Drag Code // 
//***************************************************************************** 
// Do not remove this notice. 
// 
// Copyright 2001 by Mike Hall. 
// See http://www.brainjar.com for terms of use. 
//***************************************************************************** 

// Determine browser and version. 

function Browser() { 

	var ua, s, i; 

	this.isIE    = false; 
	this.isNS    = false; 
	this.version = null; 

	ua = navigator.userAgent; 

	s = "MSIE"; 
	if ((i = ua.indexOf(s)) >= 0) { 
		this.isIE = true; 
		this.version = parseFloat(ua.substr(i + s.length)); 
		return; 
	} 

	s = "Netscape6/"; 
	if ((i = ua.indexOf(s)) >= 0) { 
		this.isNS = true; 
		this.version = parseFloat(ua.substr(i + s.length)); 
		return; 
	} 

	// Treat any other "Gecko" browser as NS 6.1. 

	s = "Gecko"; 
	if ((i = ua.indexOf(s)) >= 0) { 
		this.isNS = true; 
		this.version = 6.1; 
		return; 
	} 
} 

var browser = new Browser(); 

// Global object to hold drag information. 

var dragObj = new Object(); 
dragObj.zIndex = 0; 

function dragStart(event, id) { 

	var el; 
	var x, y; 

	// If an element id was given, find it. Otherwise use the element being 
	// clicked on. 

	if (id) 
		dragObj.elNode = document.getElementById(id); 
	else { 
		if (browser.isIE) 
			dragObj.elNode = window.event.srcElement; 
		if (browser.isNS) 
			dragObj.elNode = event.target; 

		// If this is a text node, use its parent element. 

		if (dragObj.elNode.nodeType == 3) 
			dragObj.elNode = dragObj.elNode.parentNode; 
	} 

	// Get cursor position with respect to the page. 

	if (browser.isIE) { 
		x = window.event.clientX + document.documentElement.scrollLeft 
			+ document.body.scrollLeft; 
		y = window.event.clientY + document.documentElement.scrollTop 
			+ document.body.scrollTop; 
	} 
	if (browser.isNS) { 
		x = event.clientX + window.scrollX; 
		y = event.clientY + window.scrollY; 
	} 

	// Save starting positions of cursor and element. 

	dragObj.cursorStartX = x; 
	dragObj.cursorStartY = y; 
	dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10); 
	dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10); 

	if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0; 
	if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0; 

	// Update element's z-index. 

	dragObj.elNode.style.zIndex = ++dragObj.zIndex; 

	// Capture mousemove and mouseup events on the page. 

	if (browser.isIE) { 
		document.attachEvent("onmousemove", dragGo); 
		document.attachEvent("onmouseup",   dragStop); 
		window.event.cancelBubble = true; 
		window.event.returnValue = false; 
	} 
	if (browser.isNS) { 
		document.addEventListener("mousemove", dragGo,   true); 
		document.addEventListener("mouseup",   dragStop, true); 
		event.preventDefault(); 
	} 
} 

function dragGo(event) { 

	var x, y; 

	// Get cursor position with respect to the page. 

	if (browser.isIE) { 
		x = window.event.clientX + document.documentElement.scrollLeft 
			+ document.body.scrollLeft; 
		y = window.event.clientY + document.documentElement.scrollTop 
			+ document.body.scrollTop; 
	} 
	if (browser.isNS) { 
		x = event.clientX + window.scrollX; 
		y = event.clientY + window.scrollY; 
	} 

	// Move drag element by the same amount the cursor has moved. 

	dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px"; 
	dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px"; 

	if (browser.isIE) { 
		window.event.cancelBubble = true; 
		window.event.returnValue = false; 
	} 
	if (browser.isNS) 
		event.preventDefault(); 
} 

function dragStop(event) { 

	// Stop capturing mousemove and mouseup events. 

	if (browser.isIE) { 
		document.detachEvent("onmousemove", dragGo); 
		document.detachEvent("onmouseup",   dragStop); 
	} 
	if (browser.isNS) { 
		document.removeEventListener("mousemove", dragGo,   true); 
		document.removeEventListener("mouseup",   dragStop, true); 
	} 
}