function checkNum (obj) 
{
	if (isNaN(obj.value)) {
		alert('Please enter numeric values');
		obj.value = '';
		return false;
	}
}

//load large photo
function loadPhoto(photoName,photoDesc)
{
	document.getElementById('largePhoto').src = 'photos/'+photoName;	
	document.getElementById('descID').innerHTML = photoDesc;
}