function changeframes1()
{
parent.navigatie.location="navigatie1.htm";
parent.inhoud.location="werkwijze1.htm";
}  
function changeframes2()
{
parent.navigatie.location="navigatie2a.htm";
parent.inhoud.location="portfolio1.htm";
}	  
<!-- +++++++++++++++++++++++ -->  
function changeframes2a()
{
parent.navigatie.location="navigatie2a.htm";
parent.inhoud.location="portfolio1.htm";
}
function changeframes2b()
{
parent.navigatie.location="navigatie2b.htm";
parent.inhoud.location="portfolio2.htm";
}
 function changeframes2c()
{
parent.navigatie.location="navigatie2c.htm";
parent.inhoud.location="portfolio3.htm";
} 
function changeframes2d()
{
parent.navigatie.location="navigatie2d.htm";
parent.inhoud.location="portfolio4.htm";
}
function changeframes2e()
{
parent.navigatie.location="navigatie2e.htm";
parent.inhoud.location="portfolio5.htm";
}	  
function changeframes2f()
{
parent.navigatie.location="navigatie2f.htm";
parent.inhoud.location="portfolio6.htm";
}
function changeframes2g()
{
parent.navigatie.location="navigatie2g.htm";
parent.inhoud.location="portfolio7.htm";
}
function changeframes2h()
{
parent.navigatie.location="navigatie2h.htm";
parent.inhoud.location="portfolio8.htm";
}	
function changeframes2i()
{
parent.navigatie.location="navigatie2i.htm";
parent.inhoud.location="portfolio9.htm";
}	 
function changeframes2k()
{
parent.navigatie.location="navigatie2k.htm";
parent.inhoud.location="portfolio10.htm";
}
function changeframes2m()
{
parent.navigatie.location="navigatie2m.htm";
parent.inhoud.location="portfolio11.htm";
}
function changeframes2n()
{
parent.navigatie.location="navigatie2n.htm";
parent.inhoud.location="portfolio12.htm";
}		  
function changeframes2o()
{
parent.navigatie.location="navigatie2o.htm";
parent.inhoud.location="portfolio13.htm";
}		
function changeframes2p()
{
parent.navigatie.location="navigatie2p.htm";
parent.inhoud.location="portfolio14.htm";
}	 
function changeframes2q()
{
parent.navigatie.location="navigatie2q.htm";
parent.inhoud.location="portfolio15.htm";
}
<!-- ++++++++++++++++++++++ -->	

function changeframes3()
{
parent.navigatie.location="navigatie3.htm";
parent.inhoud.location="about.htm";
}  
function changeframes4()
{
parent.navigatie.location="navigatie4.htm";
parent.inhoud.location="contact.htm";
}