function trim(value)
{
	/* Strip leading spaces from input */
	startposn=0;
	while((value.charAt(startposn)==" ")&&(startposn<value.length))
	{
		startposn++;
	}
	if(startposn==value.length)
	{
		value="";
	}
	else
	{
	  /* If anything left of string after stripping leading spaces strip trailing */
	  /* spaces as well */
	  value=value.substring(startposn,value.length);
	  endposn=(value.length)-1;
	  while(value.charAt(endposn)==" ")
	  {
	  	endposn--;
	  }
	  value=value.substring(0,endposn+1);
	}
	return(value);
}

function isMail(leChamp)
    {
    if (leChamp=="") return false;
    else
            {
            if (leChamp.indexOf("@")==-1) return false;
            else
            {
                    longueur = leChamp.length;
                    position = leChamp.indexOf("@");
                    left_str = leChamp.substring(0,position);
                    right_str = leChamp.substring(position+1,longueur);
                    left_len = left_str.length;
                    right_len = right_str.length;
                    if ((left_len==0) || (right_len==0)) return false;
                    else
                    {
                            if (right_str.indexOf(".")==-1) return false;
                            else
                            {
                                    right_longueur = right_str.length;
                                    right_position = right_str.lastIndexOf(".");
                                    l_right_str = right_str.substring(0,right_position);
                                    r_right_str = right_str.substring(right_position+1,right_longueur);
                                    l_right_len = l_right_str.length;
                                    r_right_len = r_right_str.length;
                                    if ((r_right_len < 2)||(r_right_len > 4)) return false;
                                    else if (l_right_len==0) return false;
                            }
                    }
            }
    }
    return true;
    }

	
	
	
function fichier(nom)
{
	startposn=nom.length - 3;
	fin=nom.substring(startposn,nom.length);
	if(fin=='gif')
		{
				return true;
		}
	else
	if(fin=='jpg')
		{
				return true;
		}
	else
	return false;
}