Adding http:// to existing url's
I've been running my site successfully for years, coded with Dreamweaver CS3.
In the last few weeks my Adsense ads (size 160 x 600) have sometimes been replaced with a panel (of the same size) from my server saying that 'the page (advert) cannot be found' (apparently error 404).
My 'Server's Help' say I should add http:// in front of all page URL's. First I'm wondering how I managed for all these years without it, but mainly how do I add the http:// on over 150 pages, and hopefully without having to edit each page individually.
