vector question in C++

I need to insert elements into the beginning of a vector and can't remember the name of the function. to add elements to the end I would use vector.push_back( var ) and to remove from the end, vector.pop_back( ). I want to know how add a ne wfirst element, moving existing elements back, and how to take out the first element. Thanks all.

Are you using the built in vector type (declared as "int x[y]" without quotes, and where y is the size) or some other vector class such as apvector? If you are using another vecotr class, please post the contents of the header file.

I'm using the <vector> header. I read all the functions in a reference book and there were functions for insertinf elements, but I can't remember exactly what they were.