function launchCenter(url, name, height, width) {
	var str = "height=" + height + ",innerHeight=" + height;
	str += ",width=" + width + ",innerWidth=" + width;
	if (window.screen) {
		var ah = screen.availHeight - 60;
		var aw = screen.availWidth - 10;

	    var xc = (aw - width) / 2;
	    var yc = (ah - height) / 2;

	    str += ",left=" + xc + ",screenX=" + xc;
	    str += ",top=" + yc + ",screenY=" + yc;
	    str += ",scrollbars=Yes, resizable=Yes"
	  }
	  return window.open(url, name, str);
}

function NieuwVensterA(kwnr,kleur,knnr) {

	var screenW = 800, screenH = 600;
	
	if (parseInt(navigator.appVersion)>3) {
		 screenW = screen.width;
		 screenH = screen.height;
	}
		else if (navigator.appName == "Netscape" 
		    && parseInt(navigator.appVersion)==3
		    && navigator.javaEnabled()
		   ) 
		{
		 var jToolkit = java.awt.Toolkit.getDefaultToolkit();
		 var jScreenSize = jToolkit.getScreenSize();
		 screenW = jScreenSize.width;
		 screenH = jScreenSize.height;
		}
	if (screenW>1024) {screenW=1024};
	if (screenH>800) {screenH=960};
	
	var win = launchCenter(kwnr,'center',screenH,screenW );
}

function NieuwVensterR(kwnr,kleur,knnr) {

	var screenW = 920, screenH = 720;
	
		if (parseInt(navigator.appVersion)>3) {
		 screenW = screen.width;
		 screenH = screen.height;
	}
		else if (navigator.appName == "Netscape" 
		    && parseInt(navigator.appVersion)==3
		    && navigator.javaEnabled()
		   ) 
		{
		 var jToolkit = java.awt.Toolkit.getDefaultToolkit();
		 var jScreenSize = jToolkit.getScreenSize();
		 screenW = jScreenSize.width;
		 screenH = jScreenSize.height;
		}

	
	var win = launchCenter(kwnr,'center',screenH,screenW );
}


function badImage(theImage) {
	theImage.src = 'images/onbekend.gif';
}