function showObject(obj_id){
	var obj = document.getElementById(obj_id);
	obj.style.display='block';	
}

function hideObject(obj_id){
	var obj = document.getElementById(obj_id);
	obj.style.display='none';				
}

function changePicture(which_show) {
	var element_name = '';
	if ( which_show == "prev" ) {
		cur_which_show = Get_Cookie('curpicture');
		if ( cur_which_show != 1 && cur_which_show != null ) {
			old_element_name = 'gallery'+cur_which_show;
			curNumber = cur_which_show - 1;
			element_name = 'gallery'+curNumber;
			Set_Cookie("curpicture", curNumber, 0, "/", "", 0);
			hideObject(old_element_name);
			showObject(element_name);
		}
	} else if ( which_show == "next" ){
		cur_which_show = Get_Cookie('curpicture');
		if ( cur_which_show == null ) {
			cur_which_show = 1;
		}
		if ( cur_which_show != 10 ) {
			old_element_name = 'gallery'+cur_which_show;
			curNumber = parseInt(cur_which_show) + 1;
			element_name = 'gallery'+curNumber;
			Set_Cookie("curpicture", curNumber, 0, "/", "", 0);
			hideObject(old_element_name);
			showObject(element_name);
		}
	} else {
		for ( var i=1; i<11 ; i++ ) {
			element_name = 'gallery'+i;
			if ( i == which_show ) {
				Set_Cookie("curpicture", which_show, 0, "/", "", 0);
				showObject(element_name);
			} else {
				hideObject(element_name);
			}
		}
	}
}

function Set_Cookie( name, value, expires, path, domain, secure ) {
	// set time, it's in milliseconds
	var today = new Date();
	today.setTime( today.getTime() );
	if ( expires )
	{
		expires = expires * 1000 * 60 * 60 * 24;
	}
	var expires_date = new Date( today.getTime() + (expires) );

	document.cookie = name + "=" +escape( value ) +
	( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + 
	( ( path ) ? ";path=" + path : "" ) + 
	( ( domain ) ? ";domain=" + domain : "" ) +
	( ( secure ) ? ";secure" : "" );
}

function Get_Cookie( check_name ) {
	// first we'll split this cookie up into name/value pairs
	// note: document.cookie only returns name=value, not the other components
	var a_all_cookies = document.cookie.split( ';' );
	var a_temp_cookie = '';
	var cookie_name = '';
	var cookie_value = '';
	var b_cookie_found = false; // set boolean t/f default f
	
	for ( i = 0; i < a_all_cookies.length; i++ )
	{
		// now we'll split apart each name=value pair
		a_temp_cookie = a_all_cookies[i].split( '=' );
		
		
		// and trim left/right whitespace while we're at it
		cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');
	
		// if the extracted name matches passed check_name
		if ( cookie_name == check_name )
		{
			b_cookie_found = true;
			// we need to handle case where cookie has no value but exists (no = sign, that is):
			if ( a_temp_cookie.length > 1 )
			{
				cookie_value = unescape( a_temp_cookie[1].replace(/^\s+|\s+$/g, '') );
			}
			// note that in cases where cookie is initialized but no value, null is returned
			return cookie_value;
			break;
		}
		a_temp_cookie = null;
		cookie_name = '';
	}
	if ( !b_cookie_found )
	{
		return null;
	}
}