if (document.images){
	// Company
	pic1 = new Image(); 
	pic1.src = "images/nav_company_over.gif";
	pic1_return = new Image(); 
	pic1_return.src = "images/nav_company.gif"; 
	// Mission & Vision
	pic2 = new Image(); 
	pic2.src = "images/nav_mission_over.gif"; 
	pic2_return = new Image(); 
	pic2_return.src = "images/nav_mission.gif"; 
	// Team
	pic3 = new Image(); 
	pic3.src = "images/nav_team_over.gif";
	pic3_return = new Image(); 
	pic3_return.src = "images/nav_team.gif";
	// Contact
	pic4 = new Image(); 
	pic4.src = "images/nav_contact_over.gif";  
	pic4_return = new Image(); 
	pic4_return.src = "images/nav_contact.gif";
}

function chgImg(dir,id) {
	if (dir == "over") {
		document.getElementById("img_"+id).src = "images/nav_"+id+"_over.gif";
	} else {
		document.getElementById("img_"+id).src = "images/nav_"+id+".gif";
	}
}