var url = "http://www.ccanesthesiareview.com/QOD/answers/ans" + urlDay + ".asp?ans=";
var submitted = false;  //variable to prevent double selection entry
function checkAnswer()
 {
	/* Checks to see if answer present 
	    and if answer correct Multiple Choice*/
		
	var clicked = 0; // variable for clicked radio button
	var correct = 0; // variable for correct/incorrect response
	var radios = document.forms.answers.rbut;
	for (var i = 0; i < radios.length; i++) 
	 {
		if (radios[i].checked)
		  {
			clicked  = 1;
			if (radios[i].value == 1) // correct answer selected
			{
				correct = 1;
			}
			break; // Get out of 'for' loop if button clicked
		  }
	 }
	if (submitted) // only submit once per question
	  {
	    return false;
	  }
	 if (!clicked) // no radio button selected 
	  {
		alert('Please Choose an Answer');
	  } 
    else if (!correct) // incorrect answer selected
	  {
        submitted = true;
        self.location = url + "X";
	  }
	else // correct answer selected
	  {
	   submitted = true;
	   self.location = url + "C";
	  }
	return false;
 }