var ns4;
var ie4;
var ns6;
var block;
var clickswitch;
var blckDivVis;
var formLayerVis;

function init() {
ns4 = (document.layers)? true:false;
ns6 = (document.getElementById)? true:false;
ie4 = (document.all)? true:false;
clickswitch = "open";
        if (ns4) 
		{
			//block = document.layers.blockDiv;
			blockDivVis = "show";
			formLayerVis = "hide";
			document.blockDiv.visibility = blockDivVis;
			document.formlayer.visibility = formLayerVis;
		}
        else if (ie4) {
           // block = blockDiv.style;
			blockDivVis = "visible";
			formLayerVis = "hidden";
			blockDiv.style.visibility = blockDivVis;
			formlayer.style.visibility = formLayerVis;
        }
        else if (ns6) {
           // block = blockDiv.style;
			blockDivVis = "visible";
			formLayerVis = "hidden";
			document.getElementById('blockDiv').style.visibility = blockDivVis;
			document.getElementById('formlayer').style.visibility = formLayerVis;
        }
       // block.xpos = parseInt(block.left);
}

/*function clickaction () {
	if (clickswitch == "open") {
		slide();
	} else if (clickswitch == "close") {
		restart();
	}
}

function show(id) {
                if (ns4) document.layers[id].visibility = "show";
                else if (ie4) document.all[id].style.visibility = "visible";
                else if (ns6) document.getElementById(id).style.visibility = "visible";
        }

function hide(id) {
                if (ns4) document.layers[id].visibility = "hide";
                else if (ie4) document.all[id].style.visibility = "hidden";
                else if (ns6) document.getElementById(id).style.visibility = "hidden";
        }

function slide() {

	if( ie4 )  // IE
	{
        if (block.xpos < 125)
		{
				block.xpos += 276;
                block.left = block.xpos;				
                setTimeout("slide()",30);
		}
		else
		{
			clickswitch = "close";
			show('formlayer');
		}
	}
	else  // Netscape
	{
		if (block.pageX < 125)
		{
				block.pageX += 276;
                block.left = block.pageX;
                setTimeout("slide()",30);
        }
		else
		{
			clickswitch = "close";
			show('formlayer');
		}
	}
}

function restart() {
		clickswitch = "open";
		hide('formlayer');
		if( ie4 )
		{
	        block.xpos = -55;
    	    block.left = block.xpos;
		}
		else
		{
			block.pageX = -55;
    	    block.left = block.pageX;
		}
}*/

function swapVis() {
	var showme;
	var hideme;
	var whatToDo;
	if (ie4) {
		showme = "visible";
		hideme = "hidden";
		whatToDo = (formlayer.style.visibility == showme);
		if (whatToDo) {
			formlayer.style.visibility = hideme;
			blockDiv.style.visibility = showme;
		} else {
			formlayer.style.visibility = showme;
			blockDiv.style.visibility = hideme;
		}
	} else if (ns4) {
		showme = "show";
		hideme = "hide";
		whatToDo = (document.formlayer.visibility == showme);
		if (whatToDo) {
			document.formlayer.visibility = hideme;
			document.blockDiv.visibility = showme;
		} else {
			document.formlayer.visibility = showme;
			document.blockDiv.visibility = hideme;
		}
	} else if (ns6) {
		showme = "visible";
		hideme = "hidden";
		whatToDo = (document.getElementById('formlayer').style.visibility == showme);
		if (whatToDo) {
			document.getElementById('formlayer').style.visibility = hideme;
			document.getElementById('blockDiv').style.visibility = showme;
		} else {
			document.getElementById('formlayer').style.visibility = showme;
			document.getElementById('blockDiv').style.visibility = hideme;
		}
	}
}

function advSearch() {
alert('advSearch');
	var advancedCat;
	if (ns4) {
		advancedCat = document.formlayer.document.advForm.searchByCategory[document.formlayer.document.advForm.searchByCategory.selectedIndex].value;
		document.nav.document.f2.searchByCategory.value = advancedCat;
		document.nav.document.f2.submit();
	} else if (ie4) {
		advancedCat = document.advForm.searchByCategory[document.advForm.searchByCategory.selectedIndex].value;
		nav.document.f2.searchByCategory.value = advancedCat;
		nav.document.f2.submit();
	} else if (ns6) {
		document.getElementById('searchbycat').value = document.getElementById('advsearchtab')[document.getElementById('advsearchtab').selectedIndex].value;
		document.getElementById('advsearchform').submit();
	}	
	return true;
}