function getURLParam(strParamName){
	var strReturn = "";
	var strHref = window.location.href;
	if ( strHref.indexOf("?") > -1 )
		{
		var strQueryString = strHref.substr(strHref.indexOf("?"));
		var aQueryString = strQueryString.split("&");
		for ( var iParam = 0; iParam < aQueryString.length; iParam++ )
			{
			if (aQueryString[iParam].indexOf(strParamName.toLowerCase() + "=") > -1 )
				{
				var aParam = aQueryString[iParam].split("=");
				strReturn = aParam[1];
				break;
				}
			}
		}
	return unescape(strReturn);
}

function changeImage(parameter,image){
	var tmp = getURLParam(parameter)
	document.images[tmp].src=image;
}