function nav_content( nav_li, nav_image ) {
	document.getElementById("nav-image-src").src = nav_image;
	for( var i=1; i<=5; i++ ) {
		if( i == nav_li ) {
			document.getElementById("nav-"+i).style.backgroundColor = '#b38148';
		}
		else {
			document.getElementById('nav-'+i).style.backgroundColor = '#f20017';
		}
	}
}
function clearField( field_name )
{
	document.getElementById( field_name ).value = '';
	document.getElementById( field_name ).style.backgroundColor = '';
}

function highlightFields( field_str )
{
	var fields = field_str.split(',');
	
	for( var i=0; i<fields.length; i++ )
	{
		highlightField( fields[i], '#F6F5CF' ); 
	}
	
}


function highlightField( field_name, field_color )
{
	document.getElementById( field_name ).style.backgroundColor = field_color;
}


function formatCurrency(num) 
{
	num = num.toString().replace(/\$|\,/g,'');
	if(isNaN(num))
	num = "0";
	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num*100+0.50000000001);
	cents = num%100;
	num = Math.floor(num/100).toString();
	if(cents<10)
	cents = "0" + cents;
	for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
	num = num.substring(0,num.length-(4*i+3))+','+
	num.substring(num.length-(4*i+3));
	return (((sign)?'':'-') +  num + '.' + cents);
}	//end function

function validate_required_fields(frmName, strTextBoxes)
{
	var oForm = document.getElementById(frmName);
	
	//turn the comma separated list into an array
	var arrBoxes = strTextBoxes.split(",");
	
	error = 0;
	
	//loop thru each box and determine if the text value is empty
	for( var intCount = 0; intCount < arrBoxes.length; intCount++ )
	{
		arrBoxes[intCount] = arrBoxes[intCount].trim_spaces();
		
		//alert( "inCount: " + intCount + " - text box: -->" + arrBoxes[intCount] + "<--" );
		
		var strText = document.getElementById(arrBoxes[intCount]).value;
		
		if( strText.length == 0 )
		{
			error++;
			
		}	//end if
		
	}	//end for loop
	
	//if any errors, then user did not enter all the required fields
	if( error > 0 )
	{
		alert( "Please enter all the required fields." );
		
		valid = false;
		
	}	//end if
	
	else
	{
		valid = true;
		
	}	//end else
	
	return valid;
	
}	//end function

function pop_templates()
{
	window.open('pop_templates.php','admin_pop','width=600,height=400,scrollbars=yes,resizable=yes');	
}

//removes all spaces in a string
function removespaces() 
{
	return this.replace(/.*\S/,'');
	
}	//end function

//trims leading and trailing spaces
function trim_spaces() 
{
	return this.replace(/^\s+/,'').replace(/\s+$/,'');
	
}	//end function

function clear_image( field_id )
{
	document.getElementById( 'pg-' + field_id ).src = 'images/spacer.gif';
	document.getElementById( field_id ).value = '';
	document.getElementById( field_id + '_filename' ).value = '';
}

function clear_link( field_id )
{
	document.getElementById( field_id ).value = '';
	document.getElementById( field_id + '_text' ).innerHTML = '';
	document.getElementById( field_id + '_text' ).style.backgroundColor = '';
}


function handleInquiry() {
	var inquiry = document.getElementById('inquiry').value;
	if( inquiry == 'invoice' ) {
		document.getElementById('billing-pdf-form').className="show-row";
		document.getElementById('billing-plain-form').className="show-row";
	}
	else if( inquiry != '' ) {
		document.getElementById('billing-pdf-form').className="hide-row";
		document.getElementById('billing-plain-form').className="show-row";
	}
}

function addInvoiceInput() {
	var total = document.getElementById('total-invoices').value;
	var newTotal = document.getElementById('total-invoices').value;
	newTotal++;
	document.getElementById('total-invoices').value = newTotal;
	var newInput = document.createElement('input');
	newInput.setAttribute('type','text');
	newInput.setAttribute('name','invoice' + newTotal);
	newInput.setAttribute('size','20');
	newInput.setAttribute('maxlength','255');
	newInput.setAttribute('id','invoice' + newTotal);
	var curInput = document.getElementById('invoice' + total);
	document.getElementById('invoice-numbers').appendChild(newInput);
}

function addGalleryPopup(category) {
	window.open('pop_gallery.php?category=' + category,'admin_pop','width=400,height=400,scrollbars=yes');
}

function updateGalleryPopup(category,image) {
	window.open('pop_gallery.php?category=' + category + '&img_id=' + image,'admin_pop','width=400,height=550,scrollbars=yes');
}

//assigns a new function to string types
String.prototype.removespaces = removespaces;
String.prototype.trim_spaces = trim_spaces;