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		 if textbox1.text > 15 then msgbox "Please enter a digit between 1-15"  
 
you might also want to do it so if they enter a value less than 1. 
 
if textbox1.text < 1 then msgbox "Please enter a digit between 1-15"  
 
i think these will help, but if they don't just say so, because it's been awile for me, so i might have made a mistake. 
		
		
		
		
		
		
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