function unzip([string] $path, [string]$zipFile)
{	
	if (!(test-path -path $zipFile))
	{
		return;
	}

	$shell=new-object -com shell.application;
		
	$ZipFolder = $shell.namespace("$ZipFile");
	# make sure the path is created	
	if (!(test-path -path $path))
	{
		mkdir $path | out-null;	
				
	}
	else
	{			
		foreach ($srcItem in $ZipFolder.Items())
		{
			$dstItemPath = join-path -path $path -childpath $srcItem.path;						
			
			$exists = Test-Path -Path $dstItemPath;
   
			if ($exists) # If the item doesn't exist in the desination directory...		
			{							
				Remove-Item -Path $dstItemPath -Recurse;			
			}
		}
	}
	$destinationFolder=$shell.namespace("$path");
	$destinationFolder.Copyhere($ZipFolder.items());	
}


function zip([string] $path, [string] $zipFile)
{
	# make sure the path is created
	if (!(test-path -path $path))
	{
		return;
	}
	# make sure no zip file does NOT exists, because the UI need human interaction
	if (test-path -path $zipFile)
	{
		remove-item -path $zipFile -force;		
	}
	
	set-content $zipFile ("PK" + [char]5 + [char]6 + ("$([char]0)" * 18));
	
	$src=get-item $path; 

	$shell=new-object -com shell.application;		

	$dst = $shell.namespace("$zipFile");		
	
	foreach ($item in $src)
	{		
		$dst.Copyhere($item.fullname);		
	}
}