function openPopupWithSize(url, width, height) {
    var left = Math.floor( (screen.width - width) / 2);
    var top = Math.floor( (screen.height - height) / 2);
    var popup = window.open(url, '_blank' , 'top=' + top +
    		                              ', left=' + left +
    		                              ', width=' + width +
    		                              ', height=' + height +
    		                              ', toolbar=0, directories=0, menubar=0, status=no, resizable=no, location=0, scrollbars=yes, copyhistory=0');
    popup.focus();
}

	
function openPopup(url) {
	openPopupWithSize(url, 760, 690);
}