FCKeditor error BC30311 asp net

I'm working in asp net 1.1 codebehind, visual basic , FCKeditor works good but when I try to set the width and height,give me a error

BC30311 a value of type 'integer' cannot be converted convert in '2'



this is the line code, give me the error
FCKeditor1.width = 600

any idea why , o there is another way to set width
thanks