I just wanted to know how to configure FCKEditor to upload files and images to the server where the website is hosted.

The relevant part for it's config file(i think) looks like this:

FCKConfig.LinkUpload = true ;
FCKConfig.LinkUploadURL = FCKConfig.BasePath + 'filemanager/connectors/' + _QuickUploadLanguage + '/upload.' + _QuickUploadExtension ;
FCKConfig.LinkUploadAllowedExtensions   = ".(7z|aiff|asf|avi|bmp|csv|doc|fla|flv|gif|gz|gzip|jpeg|jpg|mid|mov|mp3|mp4|mpc|mpeg|mpg|ods|odt|pdf|png|ppt|pxd|qt|ram|rar|rm|rmi|rmvb|rtf|sdc|sitd|swf|sxc|sxw|tar|tgz|tif|tiff|txt|vsd|wav|wma|wmv|xls|xml|zip)$" ;            // empty for all
FCKConfig.LinkUploadDeniedExtensions    = "" ;  // empty for no one

FCKConfig.ImageUpload = true ;
FCKConfig.ImageUploadURL = FCKConfig.BasePath + 'filemanager/connectors/' + _QuickUploadLanguage + '/upload.' + _QuickUploadExtension + '?Type=Image' ;
FCKConfig.ImageUploadAllowedExtensions  = ".(jpg|gif|jpeg|png|bmp)$" ;      // empty for all
FCKConfig.ImageUploadDeniedExtensions   = "" ;                          // empty for no one

Could it be a folder permission problem? Is this part of the config.js alright?