Into a pot, bring beer to lukewarm, take off from heat (this can be done in microwave too, in 30 seconds intervals, just lukewarm not boiled nor hot to the touch
Add the molasses and half the yeast. Let stand until foamy (about 5 minutes) and then sprinkle remainder of the yeast over. Add in oil.
Mix flour, whole wheat flour and salt
Add flour mixture into beer mixture by a cup full each time, stir to combine, with wooden spoon. Knead lightly and cover with cling wrap.
Let stand until doubled in size, for 1 1/2 h at least (in warm area)
Punch down dough and knead a little, then divide into two portions. Roll each into a loaf and place into the pans
Let stand until doubled in size again
Fill up a rectangular pan with water halfway and place on lower rack of oven
Preheat oven to 475 F and bake loaves on middle rack until hollow when tapped with knife (about 35 minutes)
Cool on rack before slicing