perform dialog
function dialog(){
var Input = document.Eliza.input.value; // capture input and copy to log
document.Eliza.input.value = "";
chatter[chatpoint] = " \n* " + Input;
elizaresponse = listen(Input);
setTimeout("think()", 1000 + Math.random()*3000);
chatpoint ++ ;
if( chatpoint >= chatmax ){ chatpoint = 0; }
return write();
}