var CurrentImage = 0, 
pgDis=false, 
ngDis=false;

setImage = function(Number)
{

	var bigImage = document.getElementById("bigImage");
	if (typeof bigImage == "object")
	{
		bigImage.src = pm[Number];
		CurrentImage = Number;
		CheckGalleryButtons();
	}
}
nextImage = function()
{
	if (CurrentImage < pm.length-1)
	{
		CurrentImage++;
		setImage(CurrentImage);
	}
}

prevImage = function()
{
	if (CurrentImage > 0)
	{
		CurrentImage--;
		setImage(CurrentImage);
	}
}

HoverGalleryButtons=function()
{ 
	var gnext = document.getElementById("gnext"),
		gprev = document.getElementById("gprev"); 
	if (typeof gnext == "object" && typeof gprev == "object")
	{		
		gnext.onmouseover=function()
		{
			if (!ngDis)
			{
				gnext.childNodes[0].src="images/btn_next_o.gif";
			}
		};
		
		gnext.onmouseout=function()
		{
			if (!ngDis)
			{
				gnext.childNodes[0].src="images/btn_next.gif";
			}
		};
		
		gprev.onmouseover=function()
		{
			if (!pgDis)
			{
				gprev.childNodes[0].src="images/btn_previous_o.gif";
			}
		};
		
		gprev.onmouseout=function()
		{
			if (!pgDis)
			{
				gprev.childNodes[0].src="images/btn_previous.gif";
			}
		};
	}
	CheckGalleryButtons();
}

CheckGalleryButtons=function()
{
	var gnext=document.getElementById("gnext").childNodes[0],
		gprev = document.getElementById("gprev").childNodes[0];
		
	if (CurrentImage == pm.length - 1)
	{
		gnext.src="images/btn_next_dis.gif";
		ngDis=true;
	}
	else
	{
		gnext.src="images/btn_next.gif";
		ngDis=false; 
	}
	
	if (CurrentImage == 0)
	{
		gprev.src="images/btn_prev_dis.gif";
		pgDis=true;
	}
	else
	{
		gprev.src="images/btn_previous.gif"; 
		pgDis=false;
	}
}