var arr = new Array(
   1, 3, 2, 4, 0, 5
);
   
var responses = new Array(arr.length);
for (i = 0; i < arr.length; ++i)
   responses[i] = -1;

function checkSel( x )
{
   if( document.form1.elements[ x ].selectedIndex == ( arr[ x ] + 1 ) )
   {
      alert( "You are correct!" );
	  responses[ x ] = 1;
   }
   else
   {
      alert( "Sorry.  Please try again." );
	  responses[ x ] = 0;
   }
   
   var correct = 0;
   for (i = 0; i < arr.length; ++i)
   {
      if (responses[ i ] < 0)
	     return;
      if (responses[ i ] == 1)
	     ++correct;
   }
   
   alert( "Congratulations! Your score is " + correct + " out of " + responses.length + ", or " + (Math.round(correct / responses.length * 100)) + "%");
   
}