function mig_jpg(o, b, jpg){
		var s = o.src.replace("-a."+jpg, "");
		s = s.replace("."+jpg, "");
		o.src = (b ? s + "-a" : s) + "."+jpg;
	}
	function project_img(num,sum,idshow) {
		for (var i = 0; i < sum; i++) {
			document.getElementById("id_tab"+idshow+i).style.display='none';
			if (num==i) {
				document.getElementById("id_tab"+idshow+i).style.display='block';
			}
	   }
	}
	function nonetab(id) { 	
		a = document.getElementById(id);
		if (a.style.display == 'block') {
			a.style.display = 'none';
		} 
		else {
			a.style.display = 'block';
		}
	}