if (document.images) {
    var boardNum = 0;
    var boardSpeed = 2000;

    // Create an array of images for the billboard 
    var billboard = new Array();
    billboard[0] = new Image();
    billboard[0].src = "logos/ASBI.gif";
    billboard[1] = new Image();
    billboard[1].src = "logos/Anderson.gif";
    billboard[2] = new Image();
    billboard[2].src = "logos/Baumann.gif";
		billboard[3] = new Image();
    billboard[3].src = "logos/Brandow.gif";
    billboard[4] = new Image();
    billboard[4].src = "logos/Burkett.gif";
    billboard[5] = new Image();
    billboard[5].src = "logos/Carpenter.gif";
    billboard[6] = new Image();
    billboard[6].src = "logos/Clark.gif";
		billboard[7] = new Image();
    billboard[7].src = "logos/Barnhart.gif";
		billboard[8] = new Image();
    billboard[8].src = "logos/DSI.gif";
    billboard[9] = new Image();
    billboard[9].src = "logos/ESI.gif";
    billboard[10] = new Image();
    billboard[10].src = "logos/ESDI.gif";
    billboard[11] = new Image();
    billboard[11].src = "logos/EsGil.gif";
    billboard[12] = new Image();
    billboard[12].src = "logos/Geocon.gif";
    billboard[13] = new Image();
    billboard[13].src = "logos/Forward.gif";
    billboard[14] = new Image();
    billboard[14].src = "logos/oakcreek.gif";

    billboard[15] = new Image();
    billboard[15].src = "logos/HighRise.gif";
    billboard[16] = new Image();
    billboard[16].src = "logos/Hilti.gif";


    billboard[17] = new Image();
    billboard[17].src = "logos/Hope.gif";
		billboard[18] = new Image();
    billboard[18].src = "logos/Martin.gif";
		billboard[19] = new Image();
    billboard[19].src = "logos/KPPF.gif";
		billboard[20] = new Image();
    billboard[20].src = "logos/Matt.gif";
    billboard[21] = new Image();
    billboard[21].src = "logos/Morley.gif";
		billboard[22] = new Image();
    billboard[22].src = "logos/NYA.gif";
    billboard[23] = new Image();
    billboard[23].src = "logos/OXY.gif";
    billboard[24] = new Image();
    billboard[24].src = "logos/Pacific.gif";

    billboard[25] = new Image();
    billboard[25].src = "logos/PCL.gif";
		billboard[26] = new Image();
    billboard[26].src = "logos/PCMAC.gif";



		billboard[27] = new Image();
    billboard[27].src = "logos/Saiful.gif";
		billboard[28] = new Image();
    billboard[28].src = "logos/SEA.gif";
		billboard[29] = new Image();
    billboard[29].src = "logos/Simon-Wong.gif";
		billboard[30] = new Image();
    billboard[30].src = "logos/Smith.gif"; 
		billboard[31] = new Image();
    billboard[31].src = "logos/Stedman.gif";

		billboard[32] = new Image();
    billboard[32].src = "logos/Twining.gif";
		billboard[33] = new Image();
    billboard[33].src = "logos/Werdowatz.gif";
		billboard[34] = new Image();
    billboard[34].src = "logos/Simpson.gif";
		billboard[35] = new Image();
    billboard[35].src = "logos/JVI.gif";
		billboard[36] = new Image();
    billboard[36].src = "logos/broadfoundation.gif";	
		billboard[37] = new Image();
    billboard[37].src = "logos/schuff.gif";		
		billboard[38] = new Image();
    billboard[38].src = "logos/verco.gif";		
		billboard[39] = new Image();
    billboard[39].src = "logos/pca.gif";
		billboard[40] = new Image();
    billboard[40].src = "logos/weidlinger.gif";			
		billboard[41] = new Image();
    billboard[41].src = "logos/Pankow.gif";			

    // Create an array of URLs that correspond to the images
    var url = new Array();
    url[0] = "http://www.asbi-assoc.org";
    url[1] = "http://www.andersondrilling.com";
    url[2] = "http://www.bau-eng.com";
		url[3] = "";
    url[4] = "http://www.burkett-wong.com";
    url[5] = "http://www.quadc.org";
    url[6] = "http://www.clarkpacific.com";
		url[7] = "http://www.debconstruct.com";
		url[8] = "http://www.dywidag-systems.com";
    url[9] = "http://www.englekirk.com";
    url[10] = "http://www.englekirk.com";
    url[11] = "http://www.esgil.com";
    url[12] = "http://www.geoconinc.com";
    url[13] = "";
    url[14] = "http://www.oakcreekenergy.com";

    url[15] = "http://www.highriseconcrete.com";
    url[16] = "http://www.us.hilti.com";

    url[17] = "http://www.hopeengineering.com";
		url[18] = "http://www.johnmartin.com";
		url[19] = "http://www.kpff.com/index_loc.asp?ldx=12";
		url[20] = "http://www.mattconstruction.com";
    url[21] = "http://www.morleybuilders.com";
		url[22] = "http://www.nyase.com";
    url[23] = "http://www.oogc.com";
    url[24] = "http://www.pswsi.com";

    url[25] = "http://www.pcl.com";
		url[26] = "http://www.precastconcrete.org";



    url[27] = "http://www.sbise.com";
    url[28] = "http://www.seaosc.org";
    url[29] = "http://www.simonwongeng.com";
		url[30] = "http://www.smithemery.com";
		url[31] = "http://www.stedman-dyson.com";

    url[32] = "http://www.twining.com";
		url[33] = "http://www.jwa-se.com";
		url[34] = "http://www.simpsonmfg.com";
		url[35] = "http://www.jvi-inc.com";	
		url[36] = "";	
     	url[37] = "http://www.schuff.com";	
		url[38] = "http://www.vercodeck.com";	
		url[39] = "http://www.cement.org";	
		url[40] = "http://www.wai.com";
		url[41] = "http://www.pankow.com";
		
}

// Function to rotate the images on the billboard
function rotateBoard() {
    if (boardNum < (billboard.length - 1)) {
         boardNum = Math.floor(Math.random()*42);
    }
    else {
        boardNum = Math.floor(Math.random()*42);
    }
    document.billboard.src = billboard[boardNum].src;
    setTimeout('rotateBoard()', boardSpeed);
}

// Function to load the appropriate URL when the user clicks on an image
function jumpBillboard() {
    window.location = url[boardNum];
}