function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		topbuttons_Layer_1_over = newImage("images/topbuttons_Layer-1-over.png");
		topbuttons_Layer_1_down = newImage("images/topbuttons_Layer-1-down.png");
		topbuttons_Layer_1_over006 = newImage("images/topbuttons_Layer-1-over-06.png");
		topbuttons_Layer_1_down007 = newImage("images/topbuttons_Layer-1-down-07.png");
		topbuttons_Layer_1_over009 = newImage("images/topbuttons_Layer-1-over-09.png");
		topbuttons_Layer_1_down010 = newImage("images/topbuttons_Layer-1-down-10.png");
		preloadFlag = true;
	}
}
http = getHTTPObject();

function getHTTPObject(){
  var xmlhttp;

  /*@cc_on

  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    }catch(e){
      try{
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }catch(E){
      xmlhttp = false;
    }
  }
  @else
    xmlhttp = false;
  @end @*/

  if(!xmlhttp && typeof XMLHttpRequest != 'undefined'){
    try {
      xmlhttp = new XMLHttpRequest();
    }catch(e){
      xmlhttp = false;
    }
  }

  return xmlhttp;
}
function changePicture(type, imagename, unitid)
{


		var url = "changeimage.php?unitid="+unitid +"&type="+type+"&imagename="+imagename;
        http.open("GET", url, true);
		http.onreadystatechange = function()
		{
			if(http.readyState == 4)
			{
					document.getElementById('mainpic').innerHTML = http.responseText;
			}
		}
		http.send(null);


}