function validateReviewMode(){
	//var selected_size =  -1;
	var selected_lesson =  -1;
	
	for (i=0; i<document.review_form.included_lessons.length; i++) {
		if (document.review_form.included_lessons[i].checked) {
			selected_lesson = document.review_form.included_lessons[i].value;
		}
	}
	
	if (selected_lesson == -1){
		document.review_form.included_lessons[1].focus;
		alert("Please select at least one lesson");
		return false;
	}
/* 
	for (i=0; i<3; i++) {
		if (document.review_form.size[i].checked) {
			selected_size = document.review_form.size[i].value;
		}
	}
	
	if (selected_size == -1){
		document.review_form.size[1].focus;
		alert("Please select the percentage of images to be included in the review");
		return false;
	}
*/
}

function validateBrowseMode(){

	var selected_lesson =  -1;
	
	for (i=0; i<document.browse_form.lesson.length; i++) {
		if (document.browse_form.lesson[i].checked) {
			selected_lesson = document.browse_form.lesson[i].value;
		}
	}
	
	if (selected_lesson == -1){
		document.browse_form.lesson[1].focus;
		alert("Please select a lesson");
		return false;
	}
	
}