function popupfrm(str) {

		var top = 'top='+ Math.floor((screen.height-620)/2)+',';
		var left = 'left='+ Math.floor((screen.width-640)/2)+',';
 	       searchWin = window.open(str,'esempio','scrollbars=no,resizable=no,width=640,height=620,'+top+left+'status=no,location=no,toolbar=no');

	}

	function pp_cstm(str,wid,hei) {

		var top = 'top='+ Math.floor((screen.height-hei)/2)+',';
		var left = 'left='+ Math.floor((screen.width-wid)/2)+',';
 	       searchWin = window.open(str,'esempio','scrollbars=no,resizable=no,width='+wid+',height='+hei+','+top+left+'status=no,location=no,toolbar=no');

	}

	function popup(str) {

		var top = 'top='+ Math.floor((screen.height-620)/2)+',';
		var left = 'left='+ Math.floor((screen.width-800)/2)+',';
 	       searchWin = window.open(str,'esempio','scrollbars=no,resizable=no,width=800,height=620,'+top+left+'status=no,location=no,toolbar=no');

	}

	function ytpp(str) {

		var top = 'top='+ Math.floor((screen.height-390)/2)+',';
		var left = 'left='+ Math.floor((screen.width-480)/2)+',';
 	       searchWin = window.open(str,'esempio','scrollbars=no,resizable=no,width=480,height=390,'+top+left+'status=no,location=no,toolbar=no');

	}

	function flikrpp(str) {
		var top = 'top='+ Math.floor((screen.height-340)/2)+',';
		var left = 'left='+ Math.floor((screen.width-570)/2)+',';
		searchWin = window.open(str,'esempio','scrollbars=no,resizable=no,width=480,height=390,'+top+left+'status=no,location=no,toolbar=no');
	}