// This function open and closes the specified menu block
	function toggleMenuBlock(linkId) {
		//alert(linkId);		
		
		// local variables for image paths
		var minusImg = 'Images/design2/minusicon.png';
		var plusImg = 'Images/design2/plusicon.png';
		
		
		var menuBlock = document.getElementById(linkId);			// The link block we are processing
		var expandImage = document.getElementById(linkId+'Img');	// The associated plus or minus image
		
		if (menuBlock.style.display=='none') {	// check the current state of the menu block
			menuBlock.style.display='block';	// and toggle it to be the opposite one
			expandImage.src=minusImg;			// update the image as well
		} else {
			menuBlock.style.display='none';
			expandImage.src=plusImg;
		}
	}