Importing Description with Link

I'm working on adding a manufacturer's link for all of our products on the website. The easiest way for me to accomplish this (I think) is using the excel document import/export feature to update products. I have successfully used this for adding custom search fields, but when I use it for this function I am running into an issue. The link shows up, but instead of linking to an outside site like it is supposed to, it adds the link to the end of my sitepath & takes them to an error page. The HTML code  I'm pasting into the excel file is exactly the same as the one I have copied from a product's description that I've updated manually (And that one works). Any suggestions?

Thanks a lot!