Verrouillage varible d'entrée en javascript

function test1()
			{	
				reponse1=parseInt(document.form1.reponse1.value);	
				
				if (resultat1==reponse1)																					
				{
					document.form1.texte.value="Bravo";		
				}
					else
					{
						document.form1.texte.value="1X1=1";		
					}
				
			}
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resultat2=n2*nbre_2;			
		
			document.write("<FORM name='form2'>");
			document.write("<big>"+"<big>"+"2x1="+"</big>"+"</big>");
			document.write("<input type='text' name='reponse2'>");
			document.write("<INPUT type='button' name='calculer' value='ok' onClick='test2()'>"+"<br>");
			document.write("<input type='text' name='texte' readonly='readonly' size='30'></br></br>");
			document.write("</FORM>");