help needed plssss

updated 01/07/07 : yeahhhh, the blog is finally up and back again. and i got it upgraded after a whole day trying and trying. sori i was sooo tired too update here yesterday...

i am going to cry now.... wahwahwah.. i was trying to backup my other blog because i am going to ugrade it to a newer version. i am currently using wordpress and Filezilla. so without really checking properly how to backup, i clever clever go and click the wwwroot file and then downloaded it. so i tot ok already. but when i go to my site, i couldn't access it and it gave me the msg "Error establishing a database connection". wahh sweat break out already... so i fast fast go and upload back the file using the file which i downloaded before but it gave me the same msg. no matter how i tried it, it won't just come back. how ah? anybody out there can give me a help? does tat mean all my posts will be gone ah? thanks in advance for anybody's help first..