coreweb.search.getSkuBox = function( form, skuName ) {
  	for (var i=0; i < form.elements.length; i++) {
	   var cbox = form.elements[i];
        if (cbox.type.indexOf('checkbox') > -1 ) {
     		if ( cbox.value.indexOf( skuName ) >= 0 ) {
     			return cbox;
     		}	    
		}
    }
    return null;
}

/**
* this really belongs in VSP, but there is no way to transparently include this function in
* QuestiaSchool and not in Questia.com.  So, we put it in both for now. Later, this business
* logic needs to be moved out of coreweb.
*/
coreweb.search.skuClicked = function(evt) {
   var form = coreweb.common.getParentForm( evt.source );
   var highschoolBox = coreweb.search.getSkuBox( form, 'Questia School - High School Collection' );
   var achieveBox = coreweb.search.getSkuBox( form, 'Questia School - Achieve Collection' );
   var professionalBox = coreweb.search.getSkuBox( form, 'Questia School - Professional Collection' ); 
   
   var psychologyBox = coreweb.search.getSkuBox( form, 'Questia Paid Collection - Psychology' ); 
   var historyBox = coreweb.search.getSkuBox( form, 'Questia Paid Collection - History' );
   var literatureBox = coreweb.search.getSkuBox( form, 'Questia Paid Collection - Literature' );
   var philosophyBox = coreweb.search.getSkuBox( form, 'Questia Paid Collection - Philosophy' ); 
   var educationBox = coreweb.search.getSkuBox( form, 'Questia Paid Collection - Education' );
   var religionBox = coreweb.search.getSkuBox( form, 'Questia Paid Collection - Religious' );
   var entireLibraryBox = coreweb.search.getSkuBox( form, 'Questia Paid Collection - Entire Library' );
       
   if ( evt.source == professionalBox ) { 
       if ( professionalBox.checked ) {
         highschoolBox.checked = false;
         achieveBox.checked = false;
       } 
   } else if(evt.source == highschoolBox || evt.source == achieveBox) { 
      professionalBox.checked = false;
   	  if ( achieveBox.checked ) {
        highschoolBox.checked = true;
      } 
   }  else if(evt.source == entireLibraryBox ) {
	   if(entireLibraryBox.checked) {
		   psychologyBox.checked = false;
		   historyBox.checked = false;
		   literatureBox.checked = false;
		   philosophyBox.checked = false; 
		   educationBox.checked = false;
		   religionBox.checked = false;
	   } else {
		   if(!psychologyBox.checked && !historyBox.checked && !literatureBox.checked &&
			  !philosophyBox.checked && !educationBox.checked && !religionBox.checked ) {
			   entireLibraryBox.checked = true;
		   }
	   }
   } else {	  
	   if(psychologyBox.checked || historyBox.checked || literatureBox.checked || 
		  philosophyBox.checked || educationBox.checked || 	religionBox.checked) {
		   entireLibraryBox.checked = false;
	   }
	   
	   if(!psychologyBox.checked && !historyBox.checked && !literatureBox.checked &&
		  !philosophyBox.checked && !educationBox.checked && !religionBox.checked ) {
		   entireLibraryBox.checked = true;
	   }
   }
}

/**
* skuCheckBox.html input elements fire the 'sku.clicked' event.
*/
questia.Events.register( 'sku.clicked', '*', coreweb.search.skuClicked );