function checkMatrix(radio, qID, oID, limit) {
	// First, prevent the selected radio from being checked
	radio.checked = false;
	
	// Now we can run the tests
	var alreadyChecked = false;

	for ( var i=1; i<limit; ++i) {
	
		if (document.getElementById('q' + qID + '_' + i + '_' + oID).checked == true) {
		var alreadyChecked = true;
		}
	
	}



	for ( var i=1; i<=limit; ++i) { document.getElementById('q' + qID + '_' + i + '_' + oID).checked = false;	}


radio.checked = true;	

}


visibleDiv="";
visibleDiv2="";


function showGroup(elementid){

    if (document.getElementById(elementid).style.display == 'none'){
        document.getElementById(elementid).style.display = '';
		
		
		
        if(visibleDiv != ""){
            if(visibleDiv != elementid){
            document.getElementById(visibleDiv).style.display = 'none';
            }
        }
        visibleDiv = elementid;
    } 
	
}