Window to input text
alertes=new Array("LightGrey","black","yellow","red",14,"Arial",100,100,300,150);
chaines=new Array("Enter your text","OK");
Parameters for look:
Colors background, border, button, text, size and font for text, coordinates
left top vertice, width and height of window.
Text to write:
Array of 2 phrases, first text for invite, second text for button.