Index: typo3/sysext/install/mod/install.js
===================================================================
--- typo3/sysext/install/mod/install.js	(revision 5877)
+++ typo3/sysext/install/mod/install.js	(working copy)
@@ -34,13 +34,13 @@
 	load: function(obj) {
 			// fallback if AJAX is not possible (e.g. IE < 6)
 		if (typeof Ajax.getTransport() != 'object') {
-			window.location.href = this.thisScript + '?eID=' + this.eID + '&cmd=' + this.cmd;
+			window.location.href = this.thisScript + '?eID=' + this.eID + '&cmd=' + this.cmd + '&hash=' + Math.random();
 			return;
 		}
 
 		new Ajax.Request(this.thisScript, {
 			method: 'get',
-			parameters: '?eID=' + this.eID + '&cmd=' + this.cmd,
+			parameters: '?eID=' + this.eID + '&cmd=' + this.cmd + '&hash=' + Math.random(),
 			onComplete: function(xhr) {
 				document.getElementsByName('TYPO3_INSTALL[localconf.php][encryptionKey]').item(0).value=xhr.responseText;
 			}.bind(this)