PHP paging function code sharing

For details, see http://qxblog.sinaapp.com/?p=100

//$count is the total number of entries, $page is the current page number, $page_size is the number of entries displayed on each page
function show_page($count,$page, $page_size)
{
 $page_count = ceil($count/$page_size); //Calculate the total number of pages

 $init=1;
 $page_len=7;
 $max_p=$page_count;
 $pages= $page_count;

 //Judge the current page number
 $page=(empty($page)||$page<0)?1:$page;
 //Get the current page url
 $url = $_SERVER['REQUEST_URI' ];
 //Remove the original page parameters in the url to add new page parameters
 $parsedurl=parse_url($url);
 $url_query = isset($parsedurl['query']) ? $parsedurl['query'] :'';
 if($url_query != ''){
 $url_query = preg_replace("/(^|&)page=$page/",'',$url_query);
 $url = str_replace($parsedurl ['query'],$url_query,$url);
 if($url_query != ''){
 $url .= '&';
 }
 } else {
 $url .= '?';
 }

 //Paging function code
 $page_len = ($page_len%2)?$page_len:$page_len+1; //Number of page numbers
 $pageoffset = ($page_len-1)/2; //About the number of page numbers Offset

 $navs='';
 if($pages != 0){
 if($page!=1){
 $navs.="Homepage "; //First page
 $navs.=""; //Previous page
 else {$navs.=" ".$i."";}
 }
 if($page!=$pages)
 {
 $navs.=" Next page ";//Next page
 $navs.="Last page"; //Last page
 } else {
 $navs .= "Next page
 $navs .= "Last page";
 }
 echo "$navs";
 }
}