function openCentered(){
	var w = screen.width; // Get the width of the screen
	var h = screen.height; // Get the height of the screen

	var win_width = 800;
	var win_height = 540;
	
	// Where to place the Window
	var left = (w - win_width)/2;
	var top = 80

	var features = 'width='+win_width+',height='+win_height
	features += ',top='+top+',left='+left+',screenX='+left+',screenY='+top;

	var win = window.open('pop.html', 'checkitout', features);
	
}

function launch800x600(img) {
newWin=window.open(img,'pop','toolbars=0,scrollbars=0,width=820,height=620,top=20,left=20')
}

function launch450x600(img) {
newWin=window.open(img,'pop','toolbars=0,scrollbars=0,width=470,height=620,top=20,left=20')
}

function show(img) {
	var i;
	for(i=1; i<8; i++){
	document.getElementById("word"+i).style.display = "none";		
	}
	document.getElementById(img).style.display="inline";	
}
	
function hide(img) {
	document.getElementById(img).style.display="none";	
}


function pop_show(img) {
		var i;
		for(i=1; i<7; i++){
		document.getElementById("nav"+i).style.display = "none";		
		}
		document.getElementById(img).style.display="inline";	
	}
	
	function pop_hide(img) {
	document.getElementById(img).style.display="none";	
	}