To make life easier for everyone in the forums we have updated two BB codes today.
If you want to add a link to the wiki do this.
Which givesCode:<WIKI>Diablo>/WIKI> replace the < and > with square brackets 
If you want to add a link to an item or skill with hover tooltips from the DiabloNut.com database do this.
Which givesCode:<DB=http://diablonut.incgamers.com/skill/demonhunter/ballistics>Ballistics</DB> replace the < and > with square brackets 
There are also handy buttons on the advanced editor to make things a little easier so look for Wiki and DB buttons there.