function getUpdate(type, parameter1, parameter2) { 
	photo_caption='';
	if(type=='load') { pc_loaded=parameter1; } //percent of image loaded
	if(type=='item') { photo_index=parameter1+1; } //index of image 

	if((pc_loaded==100) || (photo_index==1)) {
		//document.getElementById('dump').innerHTML='type = '+ type +' ' + '<br /> parameter1 = '+ parameter1 +' - parameter2 = '+ parameter2;;
		switch(photo_index) {
			case 1: case 2: case 8: case 11: case 12: case 15: case 16: case 17: case 18: case 19: case 20:  
				photo_credit_name = 'Monica Connell'; 
			break;
			case 7: case 14: 
				photo_credit_name = 'Alison Cameron'; 
			break;
			case 6: case 9: case 13:
				photo_credit_name = 'Jonathan Lane'; 
			break;	
			case 3: case 4: case 5:
				photo_credit_name = 'John Mortimer'; 
			break;	
			case 10:
				photo_credit_name = 'David Hall'; 
			break;			
		}
		document.getElementById('caption').innerHTML='Photo by: ' + photo_credit_name;
		//document.getElementById('caption').innerHTML=photo_index + ' - ' + photo_caption;
	}
	//document.getElementById('dump').innerHTML='type=' + type + ' p1=' + parameter1 + ' p2=' + parameter2 + 'i=' + photo_index + ' = ' + photo_caption;
}