function changeframes1()
{
parent.navigatie.location="navigatie1.htm";
parent.inhoud.location="informatie.htm";
}  
function changeframes2()
{
parent.navigatie.location="navigatie2.htm";
parent.inhoud.location="about.htm";
}  
function changeframes3()
{
parent.navigatie.location="navigatie3.htm";
parent.inhoud.location="portfolio0.htm";
}
function changeframes4()
{
parent.navigatie.location="navigatie4.htm";
parent.inhoud.location="contact.htm";
}