function zoom(zoomfactor)
{
	var scaleControl =document.getElementById("ddlScale");
	scaleIndex = scaleControl.selectedIndex;
	if (scaleIndex == 0 && zoomfactor == -1)
	{
		alert("You are already zoomed in to the most detailed level available");
	}
	else if (scaleIndex >= scaleControl.options.length-1 && zoomfactor == 1)
	{
		alert("You are already zoomed out to the furthest level available");
	}
	else
	{
		//alert(scaleIndex + "," + zoomfactor + "," + scaleControl.options.length)
		scaleControl.selectedIndex = scaleIndex + parseInt(zoomfactor);
		changeScale(scaleControl.value);
	}
}


function ChangeContinent(ContinentId)
{
	clearDropDown("ddlCountry");
	clearDropDown("ddlRegion");
	clearDropDown("ddlTownCity");
	
	oSelect=document.getElementById("ddlContinent");
	
	for(var i=0; i <= oSelect.length-1; i++)
	{
		if (oSelect.options[i].value == ContinentId)
		{
			oSelect.selectedIndex = i;
			
			img = document.getElementById("searchMap");
			imagename = oSelect.options[i].text.replace("|","").replace("&","").replace(" ","").replace(" ","");
			img.src = "images\\SearchMap\\" + imagename + ".gif";
			
			var ddlContinent = new AjaxDropDownController('ddlContinent','Continent','http://internationalsearch.savills.co.uk/getLookupData.aspx','');
			ddlContinent.addObserver('ddlCountry');
			ddlContinent.init();
			ddlContinent.notify();
			
			break;
		}
	}
}	

function clearDropDown(dropdownId)
{
	oSelect=document.getElementById(dropdownId);
	oSelect.disabled=true;
	for(var i=oSelect.length-1;i>=0;i--)
		{oSelect.options[i]=null;}
}

function continentNameOnMouseOver(ContinentName)
{
	oSelect=document.getElementById("ddlContinent");
	if (oSelect.options[oSelect.options.selectedIndex].text != "Please Choose")
		imagename = "images/searchMap/" + oSelect.options[oSelect.options.selectedIndex].text.replace("|","").replace("&","").replace(" ","").replace(" ","") + "_rollover_" + ContinentName + ".gif";
	else					
		imagename = "images/searchMap/continent_rollover_" + ContinentName + ".gif";
		
	return imagename
}

function continentNameOnMouseOut(ContinentName)
{

	oSelect=document.getElementById("ddlContinent");
	if (oSelect.options[oSelect.options.selectedIndex].text != "Please Choose")
		imagename = "images/searchMap/" + oSelect.options[oSelect.options.selectedIndex].text.replace("|","").replace("&","").replace(" ","").replace(" ","") + ".gif";
	else					
		imagename = "images/searchMap/searchMap.gif";
	
	return imagename
}