function showSubMenuAMC(){
		if($('sub_menu_amc').style.display == 'none'){
			$('btn_menu_amc').innerHTML = '<img src="images/btn_amc_clicked.jpg" alt="amc sa" onclick="showSubMenuAMC()" />';
			$('btn_menu_offres').innerHTML = '<img src="images/btn_offres.jpg" alt="offres" onmouseover="this.src=\'images/btn_offres_hover.jpg\'" onmouseout="this.src=\'images/btn_offres.jpg\'" onclick="showSubMenuOffres()" />';
			$('btn_menu_support').innerHTML = '<img src="images/btn_support.jpg" alt="support" onmouseover="this.src=\'images/btn_support_hover.jpg\'" onmouseout="this.src=\'images/btn_support.jpg\'" onclick="showSubMenuSupport()" />';
			if($('sub_menu_offres').style.display != 'none'){
				$('sub_menu_offres').style.display = 'none';	
			}
			if($('sub_menu_support').style.display != 'none'){
				$('sub_menu_support').style.display = 'none';	
			}
			new Effect.BlindDown('sub_menu_amc', { queue: {position:'end', scope: 'menu'}, duration: 0.3});
		}
		else{
			$('btn_menu_amc').innerHTML = '<img src="images/btn_amc.jpg" alt="amc sa" onmouseover="this.src=\'images/btn_amc_hover.jpg\'" onmouseout="this.src=\'images/btn_amc.jpg\'" onclick="showSubMenuAMC()" />';
			new Effect.Fade('sub_menu_amc');
		}
	}
	function showSubMenuOffres(){
		if($('sub_menu_offres').style.display == 'none'){
			$('btn_menu_offres').innerHTML = '<img src="images/btn_offres_clicked.jpg" alt="offres" onclick="showSubMenuOffres()" />';
			$('btn_menu_amc').innerHTML = '<img src="images/btn_amc.jpg" alt="amc sa" onmouseover="this.src=\'images/btn_amc_hover.jpg\'" onmouseout="this.src=\'images/btn_amc.jpg\'" onclick="showSubMenuAMC()" />';
			$('btn_menu_support').innerHTML = '<img src="images/btn_support.jpg" alt="support" onmouseover="this.src=\'images/btn_support_hover.jpg\'" onmouseout="this.src=\'images/btn_support.jpg\'" onclick="showSubMenuSupport()" />';
			if($('sub_menu_amc').style.display != 'none'){
				$('sub_menu_amc').style.display = 'none';	
			}
			if($('sub_menu_support').style.display != 'none'){
				$('sub_menu_support').style.display = 'none';	
			}
			new Effect.BlindDown('sub_menu_offres', { queue: {position:'end', scope: 'menu'}, duration: 0.3});
		}
		else{
			$('btn_menu_offres').innerHTML = '<img src="images/btn_offres.jpg" alt="offres" onmouseover="this.src=\'images/btn_offres_hover.jpg\'" onmouseout="this.src=\'images/btn_offres.jpg\'" onclick="showSubMenuOffres()" />';
			new Effect.Fade('sub_menu_offres');
		}
	}
	function showSubMenuSupport(){
		if($('sub_menu_support').style.display == 'none'){
			$('btn_menu_support').innerHTML = '<img src="images/btn_support_clicked.jpg" alt="support" onclick="showSubMenuSupport()" />';
			$('btn_menu_amc').innerHTML = '<img src="images/btn_amc.jpg" alt="amc sa" onmouseover="this.src=\'images/btn_amc_hover.jpg\'" onmouseout="this.src=\'images/btn_amc.jpg\'" onclick="showSubMenuAMC()" />';
			$('btn_menu_offres').innerHTML = '<img src="images/btn_offres.jpg" alt="offres" onmouseover="this.src=\'images/btn_offres_hover.jpg\'" onmouseout="this.src=\'images/btn_offres.jpg\'" onclick="showSubMenuOffres()" />';
			if($('sub_menu_amc').style.display != 'none'){
				$('sub_menu_amc').style.display = 'none';	
			}
			if($('sub_menu_offres').style.display != 'none'){
				$('sub_menu_offres').style.display = 'none';	
			}
			new Effect.BlindDown('sub_menu_support', { queue: {position:'end', scope: 'menu'}, duration: 0.3});
		}
		else{
			$('btn_menu_support').innerHTML = '<img src="images/btn_support.jpg" alt="support" onmouseover="this.src=\'images/btn_support_hover.jpg\'" onmouseout="this.src=\'images/btn_support.jpg\'" onclick="showSubMenuSupport()" />';
			new Effect.Fade('sub_menu_support');
		}
	}