public function GetPreview
Prototype:
public function GetPreview(string output, string format=PREVIEW_PNG, string size="320x240", number how_much=1, number from_where=-1)
Parameters
	
	
		
			format
		
		
			(string) has a default value of PREVIEW_PNG
		
	 
	
		
			size
		
		
			(string) has a default value of "320x240"
		
	 
	
		
			how_much
		
		
			(number) has a default value of 1
		
	 
	
		
			from_where
		
		
			(number) has a default value of -1
		
	 
 
Description:
TODO: Document this
Return value:
// TO DO