function trim(str)
{
   return str.replace(/^\s*|\s*$/g,"");
}
	
function validate_form()
{
	valid = true;
	err_msg = '';
	if ( trim(document.linkus.LinkName.value) == '' )
	{
		err_msg += 'Please enter the name of your Organisation / website.\n';
	    valid = false;
	}
	if ( trim(document.linkus.LinkURL.value) == '' )
	{
		err_msg += 'Please enter URL to links page on your site.\n';
	    valid = false;
	}
	if ( trim(document.linkus.LinkData.innerText) == '' )
	{
		err_msg += 'Please enter HTML code for a link to your site.\n';
	    valid = false;
	}
	if (err_msg != '')
	{
		alert(err_msg);
	}		
    return valid;
}