HTML code in Custom field

I’m using a custom field to display images in a slider on each post, but when I update the post after having entered the HTML code in the custom field, the code disappears. I’m assuming that there is some kind of filter that removes HTML code from custom fields when a post is saved. Is there a way to circumvent that without using a plugin?

WordPress permalinks Yahoo hosting(no .htaccess allowed)

I have moved a WordPress install to a client from sub folder to the root folder. Right now, everything works fine, except for the friendly URLs. I currently have to set the Permalink feature in “Common settings” to “Default”, which means URLs with ?p=434… At least they work. Otherewise I get a very short 404 not found error message on a white screen. I was following this tutorial, but I found I cannot write an .htaccess to my Yahoo host account and so I could not follow one of the last steps… I wonder if the 404 not found errors have to do with this problem I have had uploading the .htaccess file… I currently do not have any .htaccess file up there… So maybe MOD_REWRITE is disabled… I have just ran phpinfo() and did not find any entry on mod_rewrite. Before moving the website, when it was still on a subfolder, the friendly URLs used to work, but now they don’t. Has anyone came accross this experience and has successfully restablished the permalinks feature?