WYSIWYG editor does not work after upgrading

After I upgraded to WP 2.2.1 , I now cannot use the WYSIWYG editor. It just is like the code mode. When I switch to code there is no way for me to go back to the editor. It just gives errors.

setting a property that has only a getter
[Break on this error] eval(function(p,a,c,k,e,d){e=function(c){return(c<a?””:e(parseInt(c/a)))+((c=c%a…
jquery.js (line 1)
obj.attachEvent is not a function
[Break on this error] obj.attachEvent(“on” + name, handler);
tiny_mce_gzip.php (line 850)
window.event has no properties
[Break on this error] onLoad : function() {var r;if (tinyMCE.settings.strict_loading_mode && this.load…
tiny_mce_gzip.php (line 59)
setting a property that has only a getter
[Break on this error] eval(function(p,a,c,k,e,d){e=function(c){return(c<a?””:e(parseInt(c/a)))+((c=c%a…
jquery.js (line 1)
window.event has no properties
[Break on this error] onLoad : function() {var r;if (tinyMCE.settings.strict_loading_mode && this.load…
tiny_mce_gzip.php (line 59)
replace_element.insertAdjacentHTML is not a function
[Break on this error] replace_element.insertAdjacentHTML(“beforeBegin”, html);}var dynamicIFrame = fal…
tiny_mce_gzip.php (line 174)