function previousPortfolio(){
		if (position == 0) position = portfolioImages.length - 1;
		else position = position - 1;
		printPortfolio(portfolioType);
	}
	function nextPortfolio(){
		if (position == (portfolioImages.length - 1) ) position = 0;
		else position = position + 1;
		printPortfolio(portfolioType);
	}
	function printPortfolio(portfolioType){
		portfolioTop = Math.round ( (height - portfolioHeights[position])/2 );
		navigateTop = Math.round ( (height - 36)/2 );
		if (portfolioType == "logo") document.getElementById('portfolioString').innerHTML = '<div><img src="/www4/assets/images/portfolio/' + portfolioType + 'Portfolio/' +  portfolioImages[position] + '.png" /></div>';
		else document.getElementById('portfolioString').innerHTML = '<div><img src="/www4/assets/images/portfolio/' + portfolioType + 'Portfolio/' +  portfolioImages[position] + '.jpg" /></div><div><img src="/www4/assets/images/misc/shadow.png" style="height:8px;width:' + portfolioWidths[position] + 'px" /></div>';

		document.getElementById('portfolioString').style.top = portfolioTop + 'px';
		document.getElementById('portfolioNavigateLeft').style.top = navigateTop + 'px';
		document.getElementById('portfolioNavigateRight').style.top = navigateTop + 'px';

	}
	var position = 0;
	var height = 0;
	var portfolioTop = 0;
	var navigateTop = 0;
	for (i=0; i<portfolioHeights.length; i++) if (portfolioHeights[i] > height) height = portfolioHeights[i] ;
	document.getElementById('portfolioContainer').style.height = height  + 'px';
	printPortfolio(portfolioType);