var browserType = navigator.appName;
	var browserVersion = navigator.appVersion;
	var obj = new Object();
	var key = new Object();

	function karakterKontrol(obj)
	{
		var ch;
		key = window.event.keyCode;
		ch = String.fromCharCode(key);
		
		if(obj.name == 'KullaniciAdi')
		{
			kelime = document.guvenlikformu.KullaniciAdi.value;
			
			if(key == 46 | key == 351 | key == 305 | key == 252 | key == 231 | key == 246 | key == 63 | key == 40 | key == 41 | key == 233 | key == 44 | key == 59)
			{
				event.returnValue = 0;
			}
			else if(key == 34 | key == 287 | key == 43 | key == 39 | key == 94 | key == 37 | key == 47 | key == 42 | key == 61 | key == 60 | key == 62 | key == 58)
			{
				event.returnValue = 0;
			}
			else if(key == 35 | key == 123 | key == 125 | key == 91 | key == 92 | key == 93 | key == 95 | key == 33 | key == 38 | key == 32 | key == 36)
			{
				event.returnValue = 0;
			}
			else if(ch == '&')
				event.returnValue = 0;
			else return true;
		}
	}