var SNS_PS_MaxPages=0;
var SNS_PS_CurrentPage=0;
var SNS_PS_Pages;

function SNS_PS_Start( Pages, BlankSrc, PrevSrc, NextSrc )
{
    SNS_PS_MaxPages=Pages;
    SNS_PS_Pages=new Array(SNS_PS_MaxPages);

    //define Page Arrays
    for (var ii=0; ii < SNS_PS_MaxPages; ii++)
    {
	    SNS_PS_Pages[ii] = new Array(5);
    }

    //Define Image Arrays
    for(var row=0; row < SNS_PS_MaxPages; row++) 
    { 

	    for (var col=0; col < 5; col++)
	    {
		    SNS_PS_Pages[row][col]=new Image; 
		    SNS_PS_Pages[row][col].src=BlankSrc;
	    } 
    }
    
    //prev/next arrows
    var tImg0 = document.getElementById('SNS_PS_Img_Prev');
	var tImg1 = document.getElementById('SNS_PS_Img_Next');

	if (tImg0) tImg0.src=PrevSrc;
	if (tImg1) tImg1.src=NextSrc;

}

function SNS_PS_AddImage( Page, Column, Src )
{
    SNS_PS_Pages[ Page ][ Column ].src = Src;
}


function SNS_PS_ChangeToPage( I )
{
	if (I < 0) SNS_PS_CurrentPage = SNS_PS_MaxPages-1;
	if (I >= SNS_PS_MaxPages) SNS_PS_CurrentPage=0;
	
	var tImg0 = document.getElementById('SNS_PS_Img0');
	var tImg1 = document.getElementById('SNS_PS_Img1');
	var tImg2 = document.getElementById('SNS_PS_Img2');
	var tImg3 = document.getElementById('SNS_PS_Img3');
	var tImg4 = document.getElementById('SNS_PS_Img4');
				
	if (tImg0) tImg0.src=SNS_PS_Pages[ SNS_PS_CurrentPage ][0].src;
	if (tImg1) tImg1.src=SNS_PS_Pages[ SNS_PS_CurrentPage ][1].src;
	if (tImg1) tImg2.src=SNS_PS_Pages[ SNS_PS_CurrentPage ][2].src;
	if (tImg1) tImg3.src=SNS_PS_Pages[ SNS_PS_CurrentPage ][3].src;
	if (tImg1) tImg4.src=SNS_PS_Pages[ SNS_PS_CurrentPage ][4].src;
		
}

function SNS_PS_Prev()
{
    SNS_PS_CurrentPage--;
	SNS_PS_ChangeToPage( SNS_PS_CurrentPage);
}

function SNS_PS_Next()
{
    SNS_PS_CurrentPage++;
	SNS_PS_ChangeToPage( SNS_PS_CurrentPage );
}

function SNS_PS_SwitchToImage( I )
{

	var tImg0 = document.getElementById('SNS_PS_View');
				
	if (tImg0) tImg0.src=SNS_PS_Pages[ SNS_PS_CurrentPage ][I].src;
}