function validate_request_form ( )
{
    valid = true;
	

    if ( document.request.contact_name.value == "" )
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease enter a contact name before continuing." );
        valid = false;
	}
  
  else if ( document.request.tel.value == "" )
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease enter a contact number continuing." );
        valid = false;
	}
	
	
	  else if ( document.request.rooms.value == "" )
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease enter the number of rooms in your property." );
        valid = false;
	}
	
	
		  else if ( document.request.levels.value == "" )
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease enter the levels, or floors in your property." );
        valid = false;
	}
	
			  else if ( document.request.heating.value == "" )
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease enter the type of heating system(s) that your property has." );
        valid = false;
	}
	
	
			  else if ( document.request.construction.value == "" )
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease enter type of building construction." );
        valid = false;
	}
	

else if (( document.request.h_spec[0].checked == false  ) && ( document.request.h_spec[1].checked == false  ))
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease specify if there are any manuals or data specifications sheets on the heating system." );
        valid = false;
	}
	

else if (( document.request.aircon[0].checked == false  ) && ( document.request.aircon[1].checked == false  ))
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease specify whether you have air conditioning or not." );
        valid = false;
	}
	
	
else if (( document.request.drawings[0].checked == false  ) && ( document.request.drawings[1].checked == false  ))
    {
        document.info.info.value = " ";
		alert ( "Submission Error!\n\nPlease specify whether you have comprehensive and accurate site measured drawings or not." );
        valid = false;
	}
				
    return valid;
}