function submenu_onmouse(action, obj) {
	if(action == 'over')
		display_value = 'block';
	else
		display_value = 'none';
	
	switch(obj) {
		///// ICEGOV /////
		case 'icegov_introduction':
			left_value = '352px';
			break;
		case 'icegov_community': 
			left_value = '433px';
			break;
		case 'icegov_proceedings': 
			left_value = '512px';
			break;
		///// ICEGOV 2010 /////			
		// case 'icegov2010_introduction': 
		//	left_value = '81px';
		//	break;
		case 'icegov2010_call_for_submission': 
			left_value = '106px';
			break;
		case 'icegov2010_call_for_participation': 
			left_value = '246px';
			break;		
		case 'icegov2010_program': 
			left_value = '350px';
			break;
		case 'icegov2010_instructions': 
			left_value = '436px';
			break;
		case 'icegov2010_committees': 
			left_value = '527px';
			break;
		case 'icegov2010_organizers': 
			left_value = '614px';
			break;
		case 'icegov2010_venue': 
			left_value = '688px';
			break;
		///// PAST /////			
		case 'past_2009': 
			left_value = '351px';
			break;
		case 'past_2008': 
			left_value = '431px';
			break;
		case 'past_2007': 
			left_value = '510px';
			break;
		case 'icegov2010_important_dates': 
			left_value = '774px';
			break;
		default: 
			left_value = '0px';
			display_value = 'none';
	}

	$("#img_arrow").css({display: display_value});
	$("#img_arrow").css({left: left_value});
}