/*----------------------------------------------------------------------------*-
Function:
	$include
Params:
	file - File to include.
Return:
	-
Notes:
	Includes a script into the current document to import all their functions
	etc.  Checks for prior inclusions and only include if required.
-*----------------------------------------------------------------------------*/

var
	YSI_g_headElement = null;

$include = function (file)
{
	var
		ext = file.lastIndexOf('.');
	if (ext == -1)
	{
		return;
	}
	var
		name = file.substring(0, ext);
	// Check if there's an array list of scripts
	if ($include._scripts)
	{
		// Check if this script is included already
		if ($include._scripts[name])
		{
			// Yes, exit
			return;
		}
	}
	else
	{
		// No array, create one
		$include._scripts = [];
	} 
	// This script doesn't exist so mark it as now included
	// Create the code to go into the browser
	try
	{
		var
			script = document.createElement('script');
		if (script)
		{
			script.src = file;
			script.language = 'JavaScript1.2';
			script.type = 'text/javascript';
			script.defer = false;
			if (!YSI_g_headElement)
			{
				YSI_g_headElement = document.getElementsByTagName('head')[0];
			}
			YSI_g_headElement.appendChild(script);
			$include._scripts[name] = true;
		}
	}
	catch (e)
	{
		throw e;
	}
}