จะแบ่งหน้าค่ะ มันขึ้น error ว่า Notice: Undefined index: Page

<?php
					$strSQL = "select * from fromboard";
					$objQuery = pg_query($strSQL);
					$Num_Rows = pg_num_rows($objQuery);
					
					$Per_Page = 20;   // Per Page
					
					$Page = $_GET['Page'];
					if(!$Page){
						$Page = 1;
					}
					
					$Prev_Page = $Page-1;
					$Next_Page = $Page+1;
					
					$Page_Start = (($Per_Page*$Page)-$Per_Page);
					if($Num_Rows<=$Per_Page)
					{
					  $Num_Pages =1;
					}
					else if(($Num_Rows % $Per_Page)==0)
					{
					  $Num_Pages =($Num_Rows/$Per_Page);
					}
					else
					{
					  $Num_Pages = ($Num_Rows/$Per_Page)+1;
					  $Num_Pages = (int)$Num_Pages;
					}

					$strSQL .=" order by modified DESC LIMIT $Page_Start offset $Per_Page";
					$objQuery = pg_query($strSQL);
                  ?>