var x = new Array("map_canvas", "image1", "image2", "image3", "image4", "image5")
function changeimg(str, type)
{
	if(str=="map")
	{
		var image = "map_canvas"
        document.getElementById("map_link").style.display = "none"
	}
	else
	{
		var image = "image"+str
        document.getElementById("map_link").style.display = ""
	}
	var disp = new Array("none", "none", "none", "none", "none", "none")
	var pos = arrayplace(image, x)
	disp.splice(pos, 1, "")
	for(i=0;i<6;i++)
	{
		document.getElementById(x[i]).style.display = disp[i]
	}
    if(type=="pdf")
    {
    return true
    }
    else
    {
	return false
    }
}

function arrayplace(str, array)
{
	for(i=0;i<6;i++)
	{
		if(x[i]==str)
		{
			return i
		}
	}
}