function activeMenu(id){
//alert('d');
	var em=document.getElementById(id);
	if(id=='but_home'){
		em.style.background="transparent url(images/but.gif) no-repeat scroll 0pt -47px";
	}else if(id=='but_about_us'){
		em.style.background="transparent url(../images/but.gif) no-repeat scroll -41px -47px";
	}else if(id=='but_gallery'){
		em.style.background="transparent url(../images/but.gif) no-repeat scroll -124px -47px";
	}else if(id=='but_partners'){
		em.style.background="transparent url(../images/but.gif) no-repeat scroll -195px -47px";
	}else if(id=='but_news'){
		em.style.background="transparent url(../images/but.gif) no-repeat scroll -274px -47px";
	}else if(id=='but_contact_us'){
		em.style.background="transparent url(../images/but.gif) no-repeat scroll -419px -47px";
	}

}