query string

I'm trying to build a query string for one of my links.. for example... fant_stnd3.php?week=1&team=fun%20team I need to be able to grab the values of 'week' and 'team' from an array, I can do that no problem, but when the code runs it cuts off the value if there is a space in the string. so instead of putting "fun team" in the query string it cuts it off and just puts.. "fun " So my question, is there a function or any way to prevent this from happening? thanks.