function create_pop_up(new_location,pop_up_width,pop_up_height)
	{
		var win_x = 0;
		var win_y = 0;
		
		win_x = (screen.width - pop_up_width)/2;
		win_y = (screen.height - pop_up_height)/2;
		
		if(win_x < 0) win_x = 0;
		if(win_y < 0) win_y = 0;
	
		var pop_up_features = "status,resizable=yes,menubar,scrollbars=yes,top=" + win_y + ",left=" + win_x + ",height=" + pop_up_height + ",width=" + pop_up_width;
		newWindow = window.open(new_location,"",pop_up_features);
		newWindow.focus();
	}


	function create_resize_pop_up(new_location,pop_up_width,pop_up_height)
	{
		var win_x = 0;
		var win_y = 0;
		
		win_x = (screen.width - pop_up_width)/2;
		win_y = (screen.height - pop_up_height)/2;
		
		if(win_x < 0) win_x = 0;
		if(win_y < 0) win_y = 0;
		
		var pop_up_features = "status,resizable=yes,menubar,scrollbars=yes,top=" + win_y + ",left=" + win_x + ",height=" + pop_up_height + ",width=" + pop_up_width;
		newWindow = window.open(new_location,"",pop_up_features);
		newWindow.focus();
	}
	
	
	function create_scrolling_pop_up(new_location,pop_up_width,pop_up_height)
	{
		var win_x = 0;
		var win_y = 0;
		
		win_x = (screen.width - pop_up_width)/2;
		win_y = (screen.height - pop_up_height)/2;
		
		if(win_x < 0) win_x = 0;
		if(win_y < 0) win_y = 0;
		
		var pop_up_features = "status,resizable=yes,menubar,scrollbars=yes,top=" + win_y + ",left=" + win_x + ",height=" + pop_up_height + ",width=" + pop_up_width;
		newWindow = window.open(new_location,"",pop_up_features);
		newWindow.focus();
	}