function addButtonImages()

{

		var colButtons = document.getElementsByTagName("button");

		

		function containsClass(str, classname)

		{

			if (str.indexOf(classname) != -1)

			{

				return true;

			}

			else

			{

				return false;

			}

		}

		

		for (var i = 0; i < colButtons.length; i++)

		{

			if (containsClass(colButtons[i].className, 'add') || containsClass(colButtons[i].className, 'save'))

			{

				colButtons[i].innerHTML = '<div style="padding-right:5px; "><img src="images/tick.png" alt=""/> '+colButtons[i].innerHTML+'</div>';

			}

			else if (containsClass(colButtons[i].className, 'cancel'))

			{

				colButtons[i].innerHTML = '<div style="padding-right:5px;"><img src="images/cross.png" alt="annuleren" /> '+colButtons[i].innerHTML+'</div>';

			}

			else if (containsClass(colButtons[i].className, 'login'))

			{

				colButtons[i].innerHTML = '<div style="padding-right:5px; "><img src="images/bullet_key.png" alt="inloggen" /> '+colButtons[i].innerHTML+'</div>';

			}

			else if (containsClass(colButtons[i].className, 'undo'))

			{

				colButtons[i].innerHTML = '<div style="padding-right:5px;"><img src="images/arrow_redo.png" alt="inloggen" /> '+colButtons[i].innerHTML+'</div>';			

			}

		}

}