function doClear(theText) 
{
     if (theText.value == theText.defaultValue)
 {
         theText.value = ""
     }
 }
 
function verifmail(){
		var isOk = true; 
		var reg = new RegExp('^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)+$', 'i');
		isOk = (reg.test(document.form1.email.value)); 
		if(isOk)  document.form1.submit();
		else alert('Veuillez entrer une adresse email valide');
		
	}