var	btn_exec_coach = new Image();
var	btn_exec_coach_o = new Image();
var btn_student_tutor = new Image();
var btn_student_tutor_o = new Image();
var btn_freelance_writer = new Image();
var btn_freelance_writer_o = new Image();
var	btn_marketing_comm = new Image();
var	btn_marketing_comm_o = new Image();

function changeImage(par)
{
	if(document.images && preloadFlag == true)
	{
		if(par == "btn_exec_coach")document.btn_exec_coach.src = btn_exec_coach.src;
		if(par == "btn_exec_coach_o")document.btn_exec_coach.src = btn_exec_coach_o.src;
		if(par == "btn_student_tutor") document.btn_student_tutor.src = btn_student_tutor.src;
		if(par == "btn_student_tutor_o") document.btn_student_tutor.src = btn_student_tutor_o.src;
		if(par == "btn_freelance_writer") document.btn_freelance_writer.src = btn_freelance_writer.src;
		if(par == "btn_freelance_writer_o") document.btn_freelance_writer.src = btn_freelance_writer_o.src;
		if(par == "btn_marketing_comm") document.btn_marketing_comm.src = btn_marketing_comm.src;
		if(par == "btn_marketing_comm_o") document.btn_marketing_comm.src = btn_marketing_comm_o.src;
	}
}

var preloadFlag = false;
function preloadImages()
{
	if (document.images)
	{
		btn_exec_coach.src = "images/exec_writing_coach.gif"
		btn_exec_coach_o.src = "images/exec_writing_coach_o.gif"
		btn_student_tutor.src = "images/student_writing_tutor.gif"
		btn_student_tutor_o.src = "images/student_writing_tutor_o.gif"
		btn_freelance_writer.src = "images/freelance_business_writer.gif"
		btn_freelance_writer_o.src = "images/freelance_business_writer_o.gif"
		btn_marketing_comm.src = "images/marketing_communications.gif"
		btn_marketing_comm_o.src = "images/marketing_communications_o.gif"
	}
	preloadFlag = true;
}