function show(divid) {
document.getElementById("cat1").style.display="none";
document.getElementById("cat2").style.display="none";
document.getElementById(divid).style.display="inline";
}

function hide(divid) {
document.getElementById(divid).style.display="none";
}

function show_info(element) {
  document.getElementById(element).style.visibility = "visible";
  document.getElementById(element).style.marginTop='0px';
  document.getElementById(element).style.marginLeft='0px';
}

function hide_info(element) {
  document.getElementById(element).style.visibility = "hidden";
}


function ajax_change_pimage (element_name, pid)
{
  var op = document.getElementsByName(element_name)[0].value;

  var req = null;

                try{
                    req = new XMLHttpRequest();
                }
                catch (ms){
                    try{
                        req = new ActiveXObject("Msxml2.XMLHTTP");
                    }
                    catch (nonms){
                        try{
                            req = new ActiveXObject("Microsoft.XMLHTTP");
                        }
                        catch (failed){
                            req = null;
                        }
                    }
                }

                if (req == null)
                      alert("Error creating request object!");

				  var url = 'http://myaqua.3w-systems.de/ajax_change_pimage.php?ov='+op+'&pid='+pid;
				  req.open("GET", url, true);
                req.onreadystatechange = function(){
                    switch(req.readyState) {
                            case 4:
							if(req.status!=200) {
                                alert("Fehler:"+req.status);
                            }else{
							    document.getElementById("image_orig").innerHTML = req.responseText;
							}
                            break;
                            default:
                                return false;
                            break;
                        }
                    };

                  req.setRequestHeader("Content-Type",
                                      "application/x-www-form-urlencoded");
                req.send(null);
}