jQuery CSS Font-Weight Normal Not Working

[Kareemi]

I've googled for the last two days and browsed this site, too, but found no similar problem. I am new to jQuery and hope this is no duplicate of other posts.\[code\]$(this).css("font-weight", "bold"); //this works$(this).css({"font-weight":"bold"}); //this works as well$(this).css("font-weight", "normal"); //this doesn't work$(this).css({"font-weight":"normal"}); //this doesn't work either\[/code\]Why is it that text font weight cannot be set to NORMAL (in my case)? I use Firefox 17.0.1, but the function to set the font to normal never works in an earlier version of Firefox as well.