DOM = (document.getElementById) ? true : false;

NS4 = (document.layers) ? true : false;

IE = (document.all) ? true : false;

IE4 = IE && !DOM;

NS = (navigator.appName=="Netscape") ? true : false;

NS6 = NS && DOM;

MAC = (navigator.appVersion.indexOf("Mac") != -1);

 

function preload(imgObj,imgSrc) {

	if (document.images) {

		eval(imgObj + 'On = new Image()')

		eval(imgObj + 'On.src = imgSrc + "_o.gif"')

		eval(imgObj + 'Off = new Image()')

		eval(imgObj + 'Off.src = imgSrc + ".gif"')

	}

}



function img_act(imgName) {

	if (document.images) {

		document[imgName].src = eval(imgName + "On.src");

	}

}



function img_inact(imgName) {

	if (document.images) {

		document[imgName].src = eval(imgName + "Off.src");

	}

}



function butt_act(imgName, obj) {

	obj.src = eval(imgName + "On.src");

}



function butt_inact(imgName, obj) {

	obj.src = eval(imgName + "Off.src");

}



function changeImages() {

	if (document.images) {

    	for (var i=0; i<changeImages.arguments.length; i+=2) {

      		document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");

    		}

		}

}



function openWindow(windowURL,windowName,windowWidth,windowHeight,scroll,center) {

	newWindow = window.open(windowURL,windowName,'width='+windowWidth+',height='+windowHeight+',toolbar=0,location=0,directories=0,status=0,menuBar=0,scrollbars='+scroll+',resizable=0');

	newWindow.focus(); 

   if (center) {

      newWindow.moveTo((screen.width-windowWidth)/2,(screen.height-windowHeight)/2)

   }

}



function changeStyle(id,styleSelector,value){

	eval("document.getElementById(id).style."+styleSelector+"='"+value+"';");

}



function showElement(id) {

	document.getElementById(id).style.display = "block";

}



function hideElement(id) {

   document.getElementById(id).style.display = "none";

}



function changeCss(id,theClass) {

	document.getElementById(id).className = theClass;

}



function navChange(obj) {

   location.href = obj.value;

}



//nav

company_1On = new Image();

company_1On.src = "images/roll_surespanconstruction.gif";

company_1Off = new Image();

company_1Off.src = "images/logo_surespanconstruction.gif";



company_2On = new Image();

company_2On.src = "images/roll_surespanstructures.gif";

company_2Off = new Image();

company_2Off.src = "images/logo_surespanstructures.gif";



company_3On = new Image();

company_3On.src = "images/roll_surespanusa.gif";

company_3Off = new Image();

company_3Off.src = "images/logo_surespanusa.gif";



company_4On = new Image();

company_4On.src = "images/roll_surespanreadymix.gif";

company_4Off = new Image();

company_4Off.src = "images/logo_surespanreadymix.gif";



company_5On = new Image();

company_5On.src = "images/roll_qrengineering.gif";

company_5Off = new Image();

company_5Off.src = "images/logo_qrengineering.gif";



company_6On = new Image();

company_6On.src = "images/roll_surespan_rentals.gif";

company_6Off = new Image();

company_6Off.src = "images/logo_surespan_rentals.gif";



company_7On = new Image();

company_7On.src = "images/roll_ragingriver.gif";

company_7Off = new Image();

company_7Off.src = "images/logo_ragingriver.gif";



company_8On = new Image();

company_8On.src = "images/roll_ajbinvestments.gif";

company_8Off = new Image();

company_8Off.src = "images/logo_ajbinvestments.gif";



company_9On = new Image();

company_9On.src = "images/roll_surespanpile.jpg";

company_9Off = new Image();

company_9Off.src = "images/logo_surespanpile.gif";



company_10On = new Image();

company_10On.src = "images/roll_yukonbridge.gif";

company_10Off = new Image();

company_10Off.src = "images/logo_yukonbridge.gif";



company_11On = new Image();

company_11On.src = "images/roll_mutualconstruction.gif";

company_11Off = new Image();

company_11Off.src = "images/logo_mutualconstruction.gif";



company_12On = new Image();

company_12On.src = "images/roll_corepipelines.gif";

company_12Off = new Image();

company_12Off.src = "images/logo_corepipelines.gif";



company_13On = new Image();

company_13On.src = "images/roll_dlbcranes.gif";

company_13Off = new Image();

company_13Off.src = "images/logo_dlbcranes.gif";



company_14On = new Image();

company_14On.src = "images/roll_surefloat.gif";

company_14Off = new Image();

company_14Off.src = "images/logo_surefloat.gif";



company_15On = new Image();

company_15On.src = "images/roll_infinity.jpg";

company_15Off = new Image();

company_15Off.src = "images/logo_infinity.gif";



company_16On = new Image();

company_16On.src = "images/roll_jlg.gif";

company_16Off = new Image();

company_16Off.src = "images/logo_jlg.gif";