if (document.images) {

	button1          = new Image (160,25);
	button1.src   = "images/buttons/whats_new_button_off.gif";
	button2          = new Image (160,25);
	button2.src   = "images/buttons/whats_new_button_on.gif";

	button3          = new Image (160,25);
	button3.src   = "images/buttons/vritual_simulation_button_off.gif";
	button4          = new Image (160,25);
	button4.src   = "images/buttons/vritual_simulation_button_over.gif";

	button5          = new Image (160,25);
	button5.src   = "images/buttons/3d_imaging_button_off.gif";
	button6          = new Image (160,25);
	button6.src   = "images/buttons/3d_imaging_button_over.gif";

	button7          = new Image (160,25);
	button7.src   = "images/buttons/laser_contouring_button_off.gif";
	button8          = new Image (160,25);
	button8.src   = "images/buttons/laser_contouring_button_over.gif";

	button11          = new Image (160,25);
	button11.src   = "images/buttons/stepping_system_button_off.gif";
	button12          = new Image (160,25);
	button12.src   = "images/buttons/stepping_system_button_over.gif";

	button13          = new Image (160,25);
	button13.src   = "images/buttons/digital_archiving_button_off.gif";
	button14          = new Image (160,25);
	button14.src   = "images/buttons/digital_archiving_button_over.gif";

	button15          = new Image (160,25);
	button15.src   = "images/buttons/dicom_button.gif";
	button16          = new Image (160,25);
	button16.src   = "images/buttons/dicom_button_on.gif";

	button17          = new Image (160,25);
	button17.src   = "images/buttons/contact_details_button_off.gif";
	button18          = new Image (160,25);
	button18.src   = "images/buttons/contact_details_button_over.gif";

	button19          = new Image (160,25);
	button19.src   = "images/buttons/home_button2.gif";
	button20          = new Image (160,25);
	button20.src   = "images/buttons/home_button2_over.gif";

	button21          = new Image (160,25);
	button21.src   = "images/buttons/email_button_off.gif";
	button22          = new Image (160,25);
	button22.src   = "images/buttons/email_button_over.gif";

	button23          = new Image (160,25);
	button23.src   = "images/buttons/digital_radiology_button_off.gif";
	button24          = new Image (160,25);
	button24.src   = "images/buttons/digital_radiology_button_over.gif";

	button25          = new Image (160,25);
	button25.src   = "images/buttons/position_monitoring_button.gif";
	button26          = new Image (160,25);
	button26.src   = "images/buttons/position_monitoring_button_over.gif";

	button27          = new Image (160,25);
	button27.src   = "images/buttons/prostate_implants_button_off.gif";
	button28          = new Image (160,25);
	button28.src   = "images/buttons/prostate_implants_button_over.gif";

	button29          = new Image (160,25);
	button29.src   = "images/buttons/dha_media_button_off.gif";
	button30          = new Image (160,25);
	button30.src   = "images/buttons/dha_media_button_over.gif";

	button31          = new Image (160,25);
	button31.src   = "images/buttons/invac_button_off.gif";
	button32          = new Image (160,25);
	button32.src   = "images/buttons/invac_button_over.gif";

	button33          = new Image (160,25);
	button33.src   = "images/buttons/downloads_section_button_off.gif";
	button34          = new Image (160,25);
	button34.src   = "images/buttons/downloads_section_button_over.gif";

	button35          = new Image (160,25);
	button35.src   = "images/buttons/feedback_button_off.gif";
	button36          = new Image (160,25);
	button36.src   = "images/buttons/feedback_button_on.gif";

	button37          = new Image (160,25);
	button37.src   = "images/buttons/information_button_off.gif";
	button38          = new Image (160,25);
	button38.src   = "images/buttons/information_button_over.gif";

	button39          = new Image (160,25);
	button39.src   = "images/buttons/links_button_off.gif";
	button40          = new Image (160,25);
	button40.src   = "images/buttons/links_button_over.gif";

	button41          = new Image (160,25);
	button41.src   = "images/buttons/feedback_button_off.gif";
	button42          = new Image (160,25);
	button42.src   = "images/buttons/feedback_button_over.gif";

	button43          = new Image (160,25);
	button43.src   = "images/buttons/site_map_button_off.gif";
	button44          = new Image (160,25);
	button44.src   = "images/buttons/site_map_button_over.gif";

	button45          = new Image (160,25);
	button45.src   = "images/buttons/dha_medical_button_off.gif";
	button46          = new Image (160,25);
	button46.src   = "images/buttons/dha_medical_button_over.gif";

    button47          = new Image (160,25);
	button47.src   = "images/buttons/radpro_button.gif";
	button48          = new Image (160,25);
	button48.src   = "images/buttons/radpro_button_over.gif";

    button49          = new Image (160,25);
	button49.src   = "images/buttons/home.gif";
	button50          = new Image (160,25);
	button50.src   = "images/buttons/home_over.gif";

    button51          = new Image (160,25);
	button51.src   = "images/buttons/nomos_off.gif";
	button52          = new Image (160,25);
	button52.src   = "images/buttons/nomos_on.gif";

    button53          = new Image (160,25);
	button53.src   = "images/buttons/primafacie_off.gif";
	button54          = new Image (160,25);
	button54.src   = "images/buttons/primafacie_on.gif";
	
	
}

function swapImage(oldButton,newButton){
if (document.images){

        document.images[oldButton].src=eval(newButton + ".src");
}
}

	function window_open(filename, x, y)
		{
		  windowops = eval ("'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no,width=" + x + ",height=" + y + "'");
		  window.open(filename, 'New1', windowops);
		  return;
		}