/**
 * @author kkathman
 */
          if (document.images) {
            homebuttonup       = new Image();
            homebuttonup.src   = "images/home-btn.png" ;
            homebuttondown     = new Image() ;
            homebuttondown.src = "images/home-btn-hov.png" ;

            servicesbuttonup       = new Image();
            servicesbuttonup.src   = "images/services-btn.png" ;
            servicesbuttondown     = new Image() ;
            servicesbuttondown.src = "images/services-btn-hov.png" ;
			
			portfoliobuttonup       = new Image();
            portfoliobuttonup.src   = "images/portfolio-btn.png" ;
            portfoliobuttondown     = new Image() ;
            portfoliobuttondown.src = "images/portfolio-btn-hov.png" ;
			
		    newsbuttonup       = new Image();
            newsbuttonup.src   = "images/news-btn.png" ;
            newsbuttondown     = new Image() ;
            newsbuttondown.src = "images/news-btn-hov.png" ;
			
		    teambuttonup       = new Image();
            teambuttonup.src   = "images/team-btn.png" ;
            teambuttondown     = new Image() ;
            teambuttondown.src = "images/team-btn-hov.png" ;
			
		    contactusbuttonup       = new Image();
            contactusbuttonup.src   = "images/contactus-btn.png" ;
            contactusbuttondown     = new Image() ;
            contactusbuttondown.src = "images/contactus-btn-hov.png" ;
          }
		  
          function buttondown( buttonname ) {
            if (document.images) {
              document[ buttonname ].src = eval( buttonname + "down.src" );
            }
          }
		  
          function buttonup ( buttonname ) {
            if (document.images) {
              document[ buttonname ].src = eval( buttonname + "up.src" );
            }
          }