var main_pic_id = -1; //Initialization

var pic = new Array();
var caption = new Array();

pic = [
	   "/pics/home_page/white_house_dc_jam.jpg",
	   "/pics/home_page/corpus_christi_sym_5.jpg",
   	   "/pics/home_page/sym_5_all.jpg",
	   "/pics/home_page/sym_5_eng_comp_win.jpg",
	   "/pics/home_page/sym_5_phy_lf_win.jpg",
	   "/pics/home_page/btd2_group.jpg", 
	   "/pics/home_page/btd5_group.jpg", 
	   "/pics/home_page/btd4_group.jpg", 
	   "/pics/home_page/pvamu_ee.jpg", 
	   "/pics/home_page/sym_4_1.jpg", 
	   "/pics/home_page/sym_4_2.jpg", 
	   "/pics/home_page/sym_4_3.jpg", 
	   "/pics/home_page/sym_4_4.jpg"
	   ];

caption = [
		   "View of The White House from the NSF Jam Session (06/2009)",
		   "View of Corpus Christi from the 5th Annual Symposium (02/2009)",
		   "Participants from the 5th Annual Symposium (02/2009)",
		   "Jessica D.'s 1st Place Poster (5th Annual Symposium)",
		   "Peter M.'s 1st Place Poster (5th Annual Symposium)",
		   "BTD Students", 
		   "BTD V Students (TAMU)",
		   "BTD IV Students (TAMU)",
		   "Prairie View A&M Campus",
		   "4th Annual TAMUS LSAMP Symposium (02/2008)",
		   "4th Annual TAMUS LSAMP Symposium (02/2008)",
		   "4th Annual TAMUS LSAMP Symposium (02/2008)",
		   "4th Annual TAMUS LSAMP Symposium (02/2008)"
		   ];

var num_pics = pic.length;

function pic_init(){
	main_pic_id = (main_pic_id + 1) % num_pics;
	document.getElementById("main_pic").src = pic[main_pic_id];
	document.getElementById("main_pic").alt = caption[main_pic_id];
	document.getElementById("main_caption").innerHTML = caption[main_pic_id];
}

function next_pic(){
	main_pic_id = (main_pic_id + 1) % num_pics;
	trans_pic();
}

function prev_pic(){
	main_pic_id = (main_pic_id -1 + num_pics) % num_pics;
	trans_pic();
}

// Does picture transitions using transparency
function trans_pic(){
	
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=95)'; document.getElementById('main_pic').style.opacity=.95",50);	
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=90)'; document.getElementById('main_pic').style.opacity=.90",100);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=85)'; document.getElementById('main_pic').style.opacity=.85",150);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=80)'; document.getElementById('main_pic').style.opacity=.80",200);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=75)'; document.getElementById('main_pic').style.opacity=.75",250);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=70)'; document.getElementById('main_pic').style.opacity=.70",300);						
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=65)'; document.getElementById('main_pic').style.opacity=.65",350);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=60)'; document.getElementById('main_pic').style.opacity=.60",400);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=55)'; document.getElementById('main_pic').style.opacity=.55",450);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=50)'; document.getElementById('main_pic').style.opacity=.50",500);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=45)'; document.getElementById('main_pic').style.opacity=.45",550);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=40)'; document.getElementById('main_pic').style.opacity=.40",600);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=35)'; document.getElementById('main_pic').style.opacity=.35",650);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=30)'; document.getElementById('main_pic').style.opacity=.30",700);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=25)'; document.getElementById('main_pic').style.opacity=.25",750);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=20)'; document.getElementById('main_pic').style.opacity=.20",800);						
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=15)'; document.getElementById('main_pic').style.opacity=.15",850);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=10)'; document.getElementById('main_pic').style.opacity=.10",900);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=05)'; document.getElementById('main_pic').style.opacity=.05",950);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=00)'; document.getElementById('main_pic').style.opacity=.00",1000);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=00)'; document.getElementById('main_pic').style.opacity=.00",1100);

	var z = setTimeout("change_pic()",1100);
	
}


function change_pic(){

	document.getElementById("main_pic").src = pic[main_pic_id];
	document.getElementById("main_pic").alt = caption[main_pic_id];
	document.getElementById("main_caption").innerHTML = caption[main_pic_id];

	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=05)'; document.getElementById('main_pic').style.opacity=.05",50);	
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=10)'; document.getElementById('main_pic').style.opacity=.10",100);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=15)'; document.getElementById('main_pic').style.opacity=.15",150);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=20)'; document.getElementById('main_pic').style.opacity=.20",200);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=25)'; document.getElementById('main_pic').style.opacity=.25",250);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=30)'; document.getElementById('main_pic').style.opacity=.30",300);						
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=35)'; document.getElementById('main_pic').style.opacity=.35",350);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=40)'; document.getElementById('main_pic').style.opacity=.40",400);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=45)'; document.getElementById('main_pic').style.opacity=.45",450);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=50)'; document.getElementById('main_pic').style.opacity=.50",500);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=55)'; document.getElementById('main_pic').style.opacity=.55",550);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=60)'; document.getElementById('main_pic').style.opacity=.60",600);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=65)'; document.getElementById('main_pic').style.opacity=.65",650);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=70)'; document.getElementById('main_pic').style.opacity=.70",700);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=75)'; document.getElementById('main_pic').style.opacity=.75",750);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=80)'; document.getElementById('main_pic').style.opacity=.80",800);						
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=85)'; document.getElementById('main_pic').style.opacity=.85",850);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=90)'; document.getElementById('main_pic').style.opacity=.90",900);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=95)'; document.getElementById('main_pic').style.opacity=.95",950);
	var t = setTimeout("document.getElementById('main_pic').style.filter='alpha(opacity=100)'; document.getElementById('main_pic').style.opacity=1.00",1000);
	
}