large negative parameter correlations in regression

I have a simple 3 variable plus intercept regression model with good
goodness of fit statistics - high Rsq and t-ratios. When I calculate the
correlation matrix of the parameter estimates I get a large negative
correlation between the intercept and one of the other parameters (-0.98).
To investigate whether I have multicollinearity I have used the R-package
and the VIF is only given for the non-intercept parameters in the model (the
VIFs are 1, 7.5 and 7.5). There are no worrysome correlations in the ACTUAL
variables, including a constant intercept. Should I be concerned? Thanks.



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