/////////////////////////////////////
////// functions for shadows managment
/////////////////////////////////////
function addShadow(divId){
	var content = document.getElementById(divId).innerHTML;
	content = '<div class="shadow_top_left"></div> ' +
				'<div class="shadow_top"></div>' +
				'<div class="shadow_top_right"></div>' +
    			'<div class="shadow_right"></div>' +
				'<div class="shadow_bottom_right"></div>' +
				'<div class="shadow_bottom"></div>' +
				'<div class="shadow_bottom_left"></div>' +
				'<div class="shadow_left"></div> '  + content;
	document.getElementById(divId).innerHTML = content;			
}