function changeCssClass(objDivID,myImg)
        {
			
            if(document.getElementById(objDivID).className=='blocks_black22')
            {
               	document[myImg].src='http://www.metrovista.com/images/arrow_right_green.jpg';
				document.getElementById(objDivID).className = 'blocks_green';

            }
            else
            {
                document.getElementById(objDivID).className= 'blocks_black22';
                document[myImg].src='http://www.metrovista.com/images/arrow_right15.jpg';
            }
        }