function swapbio (ex, num) {
			var _id = 'mentor';
			var _iname = 'img';
			var _aname = 'imgac';
			total = 49; // change number to the number of mentors
			total2 = 49;
			
			// mentors profile
			for(x=0;x<total;x++) {
					if(ex==x) {
							_id += ex;					
							document.getElementById(_id).style.display = 'block';
					} else {
							_id += x;					
							document.getElementById(_id).style.display = 'none';	
					}
				
					
					_id = 'mentor';
				}
			
			//mentors active inactive
			if(num != null) {
				for(y=0;y<total2;y++) {
						_iname += y;
						_aname += y;
						
						if(num==y) {
								document.getElementById(_iname).style.display = 'none';
								document.getElementById(_aname).style.display = 'block';								
							} else {
								document.getElementById(_aname).style.display = 'none';
								document.getElementById(_iname).style.display = 'block';
							}
							
						_iname = 'img';
						_aname = 'imgac';
					}
			} else {
							
							document.getElementById('img0').style.display = 'none ';
							document.getElementById('imgac0').style.display = 'block';
			}
	}
	
// image over image out
// accept image name, option, image 1, image 2
// return 
function image_event(image_name, imgreplacement) {
		file = '../images/mentors/';
		file += imgreplacement;
		//alert(file);
		image_name.src = file;
}
//onmouseover="image_event(imgname, 'images/s_asc.png')" onmouseout="image_event(imgname, 'images/s_desc.png')"><img src="images/s_desc.png" name="imgname" width="11" height="9" border="0"></a>