function changeslide (where)
{

	if (where == 1)
	{
		document.getElementById('extendednav').style.display = 'block';
		document.getElementById('personalextendednav').style.display = 'none';
		document.getElementById('navigation').style.height = 205 + 'px';
	}
	
	else if (where == 4)
	{
		document.getElementById('personalextendednav').style.display = 'block'
		document.getElementById('extendednav').style.display = 'none';
		document.getElementById('navigation').style.height = 205 + 'px';
	}
	else
	{
		document.getElementById('extendednav').style.display = 'none';
		document.getElementById('personalextendednav').style.display = 'none';
		document.getElementById('navigation').style.height = 160 + 'px';
	}
	
	
	var pages = new Array 
	pages[0] = 'home'
	pages[1] = 'content'
	pages[2] = 'bibliography'
	pages[3] = 'introduction'
	pages[4] = 'personal'
	pages[5] = 'summary'
	
	for (i=0; i < 6; i++)
	{
		document.getElementById(pages[i]).style.display = 'none';
	}
	document.getElementById(pages[where]).style.display = 'block';
	
	

}