// BROWSER DETECT
var get_platform;
  
if (navigator.platform.indexOf("Mac") >= 0) {
    get_platform = "mac";
}
else if (navigator.platform.indexOf("Win") >= 0) {
    get_platform = "win";
}
 
if (get_platform == "win") { 
	document.write("<link rel=stylesheet href=\"styles_win.css\" type=\"text/css\">"); 
} 
if (get_platform == "mac") {
	document.write("<link rel=stylesheet href=\"styles_mac.css\" type=\"text/css\">");
}
	

// FORM VALIDATION
function getCheckedSelectOptions(select) {
	
	var arr = new Array();
	for (var i=0,j=0; i < select.length; i++) {
		if (select.options[i].selected) {
			arr[j++] = i;
		}
	}	

	if (arr.length > 0) {
		return arr;
	} 
	else 
	{
		return -1;
	}
}

function validateForm(form) {
  
	if ((getCheckedSelectOptions(form.category) == -1) || (getCheckedSelectOptions(form.category) == 0)) {
		alert("Please select a catalog.");
		return false;
	}
	return true;  // form valid - submit to ACTION URL
}