function Pop(szPop,szPWidth,szPHeight) {
					var clPopPop = null // handle for the pop window
	        //riceve file, larghezza, altezza
	        var szFile

	        var szWidth = szPWidth
	        var szHeight = szPHeight

	        // compone stringa parametri finestra
	        var szWinFeatures = "scrollbars=yes"
	                szWinFeatures += ",width="
	                szWinFeatures += szWidth
	                szWinFeatures += ",height="
	                szWinFeatures += szHeight
				    szWinFeatures += ",left="
				    szWinFeatures += 200
				    szWinFeatures += ",top="
				    szWinFeatures += 50

	        var szErrMsg  = "\nIl Vostro Browser non e' stato in grado di aprire un'altra finestra "
	                szErrMsg += "\nper visualizzare il documento richiesto.  Vi preghiamo di chiudere"
	                szErrMsg += "\ntutte le finestre inutilizzate del browser , e riprovare."

	        if (szPop)
	                szFile = szPop   // open with a given file
	        else
	                szFile = "/def_pop.htm"  // by default, open the Default Pop file

	        // Netscape Navigator allows only 100 windows at a time
	        // use the existing one to avoid exceeding the limit
	        if (clPopPop) {
	                if (!clPopPop.closed)    // if Pop window not closed
	                        clPopPop.location.href = szFile
	                else
	                        clPopPop = window.open(szFile, 'Pop', szWinFeatures)
	        } else
	                clPopPop = window.open(szFile, 'Pop', szWinFeatures)


	        // check if new window failed to open
	        if (clPopPop)
	                clPopPop.focus()
	        else
	                alert(szErrMsg)
	}