function showBox(num,form){
	var i = num-1;
	
	if (num==99){
		for (var j=1; j<form.course.length+1; j++){	//resets form
		document.getElementById('option'+j).style.color='#aaaaaa'; 	//gray text
		document.getElementById('ceu'+j).disabled = true;			// disable ceu button
		document.getElementById('ac'+j).disabled = true;			// disable credit button
		}
	}
	else if (num==50){ // only for acmm course ii
		document.getElementById('acx').disabled = false;				// denable credit button
	}
	else if (form.course[i].checked==true){
		document.getElementById('option'+num).style.color='#000000';	//black text	
		document.getElementById('ceu'+num).disabled = false;			// enable ceu button
		document.getElementById('ac'+num).disabled = false;				// denable credit button
		document.getElementById('ceu'+num).checked = true;				// check ceu button
	}
	else if (form.course[i].checked==false){
		document.getElementById('option'+num).style.color='#aaaaaa';	//gray text
		document.getElementById('ceu'+num).disabled = true;				// disable ceu button
		document.getElementById('ac'+num).disabled = true;				// disable credit button
		for (var j=0; j<form.course.length; j++){
      		if (document.getElementById('ceu'+num).checked) {			// unchecks all ceu buttons of particulaar course
        	document.getElementById('ceu'+num).checked = false;
        	break;
			}
      		if (document.getElementById('ac'+num).checked) {			// unchecks all credit buttons of particulaar course
        	document.getElementById('ac'+num).checked = false;
        	break;
    		}
		}
	}
}