Allaire Corp is not having a lot of luck with its attempts to go public. Last August the Cambridge, Massachusetts-based supplier of the Cold Fusion web application server and HomeSite web development tool filed to go public and had to withdraw in late October during one of last year’s volatile periods in the market. It chose to opt for a private placement instead, but changed its mind again and on December 9 announced its IPO for a second time. Yesterday, despite the plunge in stocks, and in particular internet stocks, the company decided to increased both the price and the volume of its IPO ahead of its pricing last night. It will now offer 2.5 million, instead of 2.2 million shares at a target price range of between $19 and $20, versus $15 to $17, according to lead manage Credit Suisse First Boston.