function roll(nm,id) {
	var i;
	if(id==undefined) i=document.getElementById('ikonka');
		else {
			i=document.getElementById(id);
			if (i.style.visibility=='hidden') i.style.visibility='visible';
				else i.style.visibility='hidden';
		}
	i.src='/images/'+nm+'.jpg';
}
function MM_preloadImages() { //v3.0 by Macromedia
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
 var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
 if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src='/images/'+a[i]+'.jpg';}}
}
MM_preloadImages('gruz','betonootdel','dor_t','beton','katki','almaz','drugoe');