function gl_UseEmail(lo_Checkbox, lc_Values)
{
	SaveCheckbox(lo_Checkbox, '1,0');
	if (lo_Checkbox.checked == true)
	{
		document.getElementById('txtUsername').value=document.getElementById('txtEmailAddress').value;
		document.frmRegister.txtUsername.disabled=true;
	}
	else
	{
		//document.getElementById('txtUsername').value='';
		document.frmRegister.txtUsername.disabled=false;
		document.frmRegister.txtUsername.focus();
	}
}