function GetParam(name)
{
  var start=location.search.indexOf("?"+name+"=");
  if (start<0) { start=location.search.indexOf("&"+name+"="); }
  if (start<0) { return ''; }
  start += name.length+2;
  var end=location.search.indexOf("&",start)-1;
  if (end<0) { end=location.search.length; }
  var result=location.search.substring(start,end);
  var result='';
  for(var i=start;i<=end;i++) {
    var c=location.search.charAt(i);
    result=result+(c=='+'?' ':c);
  }
  return unescape(result); 

}

var currImg = 1;

var nextImg   = 0;

var imgCount  = 7;
var divPrefix = "im";

function showImg(){
    var passedId = GetParam('pid');
    if (passedId > 0) {
        show("im" + passedId);
        currImg =  passedId;
        //MM_preloadImages('/images/im' + passedId);
    }
    else {
        show("im" + currImg);
    }
} 

function swapPhoto(x) {
	currImg = currImg - 0;
	nextImg = currImg + x;
	if ( nextImg > imgCount ) {
  		nextImg = 1;
	}

	if ( nextImg < 1 ) {
  		nextImg = imgCount;
	}
	hide("im" + currImg);
	show("im" + nextImg);
	currImg = nextImg;
}

function show(id) {
	var b;
	//alert("show "+id);
	if (document.getElementById){
 		b = document.getElementById(id);
 		b.style.display="block";		

	}
}

function hide(id) {
	var c;
	//alert("hide "+id);
	if (document.getElementById){
  		c = document.getElementById(id);
  		c.style.display="none";
	}
}