//use this to confirm they want to go to the webpage
	var answer = confirm("Are you sure you want to go to this website?");
				if (answer == true)
				window.location.href ="http://www.yahoo.com";	
				
				
				
				
				
			//use window.close() to exit a webpage	
			if(yahoo.checked)
			{
				var answer = confirm("Are you sure you want to go to this website?");
				if (answer == true)
				window.location.href ="http://www.yahoo.com";	
			}
			
		else if(exit.checked)			
			{
				window.close();
			}			
		else
			{
			
				alert("Please make a selection.");
									
			}