function swapRow(){
	var row2 = document.getElementById("course_old");
	var row1 = document.getElementById("course_new");
	var is_new = document.getElementById("is_new_course");

	if (is_new.value == 1){
		row1.style.display = 'none';
		row2.style.display = '';
		is_new.value = '0';
	}
	else {
		row1.style.display = '';
		row2.style.display = 'none';
		is_new.value = '1';
	}
}

function initRow(is_new){
	var row2 = document.getElementById("course_old");
	var row1 = document.getElementById("course_new");
	
	if ( ! is_new){
		row1.style.display = 'none';
		row2.style.display = '';
	}
	else
	{
		row1.style.display = '';
		row2.style.display = 'none';
	}
	
}

function append(node,className) { //add a given class to a given element
				var c = node.getAttribute("class");
				if (c==null) {
					node.setAttribute("class",className);
					return;				
				}
				if (c.match(className)==null) {
					c = c + " " + className;
					node.setAttribute("class", c);
				}
}		
			
function remove(node,className) { //remove a given class from a given element
				var c = node.getAttribute("class");
				if (c==null) {
					return;				
				}
				if (c.match(className)!=null) {
					var i = c.indexOf(className);
					var c1 = c.substr(0,i);
					var c2 = c.substr(i+className.length);
					c = c1+c2;
					node.setAttribute("class", c);
				}	
}