function bepaalFotoGrootte()
            {
                if (document.body)
                {
				var breedte=window.screen.width;
				var hoogte=window.screen.height;
				if (breedte < 481){breedte="mobiel";}
				switch (breedte)
					{
						case "mobiel":document.body.style.backgroundImage="url(documentenmap/images/backgrounds/bg1-480x320.jpg)";break;
						case 800:document.body.style.backgroundImage="url(documentenmap/images/backgrounds/bg1-800x600.jpg)";break;
						case 1024:document.body.style.backgroundImage="url(documentenmap/images/backgrounds/bg1-1024x768.jpg)";break;
						case 1280:document.body.style.backgroundImage="url(documentenmap/images/backgrounds/bg1-1280x1024.jpg)";break;
						case 1440:document.body.style.backgroundImage="url(documentenmap/images/backgrounds/bg1-1440x900.jpg)";break;
						case 1680:document.body.style.backgroundImage="url(documentenmap/images/backgrounds/bg1-1680x1050.jpg)";break;
						case 1920:document.body.style.backgroundImage="url(documentenmap/images/backgrounds/bg1-1920x1200.jpg)";break;
					}

				}
			}