While using glycerine works perfect if you don't have a fogger or hazer yet. But you have to be careful with it (I would monitor the temp because like people have stated before it will create toxic fumes) The hassle of getting glycerine on a regular basis will probably cost way more then just spending 25 Euro's on a fogger.
It will be easier in the long run to just plug it in wait a few mins and fill the room with fog. sure a 25 euro fogger wont last ages but for 25 euros it probably way better then heating glycerine.
http://www.conrad.com/ce/en/product/...e&rt=home&rb=1
1x - 2W RGB DT40Pro (Currently building)
1x - 1W RGB PT25K
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EtherDream, LaserShowExpress, Ipad (TouchOSC)
-Hybridz0rz