<!--
// Multiple-Choice with Images, Charles Kelly, May 1998
// Calculates score, prevents double answers, gives feedback.
t=0;
s=0;
d=new Array;
function f(q,a){
	if(!d[q]){d[q]=-1;
		m="";
		t++;
		if(a==1){s++;
			m="CORRECT!"
			}else{m="WRONG!"
			};
		w="Score: "+Math.round((s/t)*100)+" percent\n("+s+" out of "+t+")";
		m+="\n\n\n"+w;
		alert(m);
		document.q.s.value="Score: "+Math.round((s/t)*100)+"% ("+s+"/"+t+")"
	}else{
		alert("You've already answered that one.")
	}
}
//-->