function changeImage(pic,cap){
		document.getElementById('port_img').src = '/images/' + pic;
		//document.getElementById('caption').innerHTML = cap;
		
		document.getElementById('view1').src = '/images/white.gif';
		document.getElementById('view2').src = '/images/white.gif';
		document.getElementById('view3').src = '/images/white.gif';
		if(cap==1){
			document.getElementById('view1').src= '/images/purple.gif';
		}else if(cap==2){
			document.getElementById('view2').src= '/images/purple.gif';
		}else{
			document.getElementById('view3').src= '/images/purple.gif';
		}
}