String.prototype.trim = function()
{
	return( this.replace(/(^\s+)|(\s+$)/g, "") );
}

String.prototype.is_email = function()
{
	return( /.*@.*\..+/.test(this) );
}

Array.prototype.in_array = function(val)
{
	var i, len = this.length;
	
	for (i = 0; i < len; i++)
		if ( this[i] == val )
			return( true );
	
	return( false );
}

function get_event(e)
{
	var obj = e;
	if ( window.event )
	{
		obj.layerX = e.offsetX;
		obj.layerY = e.offsetY;
		obj.target = e.srcElement;
		obj.preventDefault = function() { event.returnValue = false; }
		obj.stopPropagation = function() { event.cancelBubble = true; }
	}
	return( obj );
}

function get_node_info(node)
{
	var xPos = 0, yPos = 0, width = 0, height = 0, srcNode = node;
	while ( node.nodeType == 1 )
	{
		if (node.tagName != "TR")
		{
			xPos += node.offsetLeft;
			yPos += node.offsetTop;
		}
		
		if ( node.offsetParent )
			node = node.offsetParent;
		else break;
	}
	
	if (typeof srcNode.offsetWidth != "undefined")
	{
		width = srcNode.offsetWidth;
		height = srcNode.offsetHeight;
	} else if (typeof srcNode.width != "undefined") {
		width = srcNode.width;
		height = srcNode.height;
	}
	return( { x : xPos , y : yPos , w : width , h : height } );
}

function check_username(str)
{
	var err = [];
	var min_chars = 5;
	var max_chars = 20;
	
	if ( str.trim() == "" )
		return( true );
	
	var strlen = str.length;
	
	if ( strlen > 0 && strlen < min_chars )
		err.push("Your username must have at least "+ min_chars +" characters.  Your username currently uses "+ strlen);
	else if ( strlen > max_chars )
		err.push("Your usrename cannot have more than "+ max_chars +" characters.  Your username currently users "+ strlen);
	
	if ( err.length > 0 )
	{
		alert( "Your username does not meet the following criteria:\n\n\t"+ err.join("\n\t") );
		return( false );
	} else
		return( true );
}

function check_password(str)
{
	if ( str.trim() == "" )
		return( true );
	
	var err = [];
	var min_chars = 7;
	var max_chars = 20;
	
	if ( !(/[0-9]/.test(str)) )
		err.push("Password does not contain at least one numeric character.");

	if ( !(/[A-Z]/i.test(str)) )
		err.push("Password does not contain at least one alphabetic character.");
    
    if ( str.length < min_chars )
    	err.push("Password is too short; the minimum password length is "+ min_chars +" characters.");
    else if ( str.length > max_chars )
		err.push("Password is too long; the maximum password length is "+ max_chars +" characters.");
    
	if ( err.length > 0 )
	{
		alert( "Your password does not meet the following criteria:\n\n\t"+ err.join("\n\t") );
		return( false );
	} else
		return( true );
}