//form field validator
function require(form){

//special check
		var checkSelect=form.instrument_type_id
			if(checkSelect){
				var myindex=checkSelect.selectedIndex;
				if (myindex==0) {
					alert("\nPlease choose an instrument type.");
					checkSelect.focus();
					return false;
					}
				}

	var validationSet = {
		'first_name': {
		'regexp': /^\w{2,}/,
		'error': 'Please enter your first name.'
		},
		'last_name': {
		'regexp': /^\w{2,}/,
		'error': 'Please enter your last name.'
		},
		'maker': {
		'regexp': /^\w{2,}/,
		'error': 'Please enter the name of the instrument maker.'
		},
		'year_made': {
		'regexp': /^\d{4}$/,
		'error': 'Please enter the year made or a year to use for sorting.'
		},
		'type_name': {
		'regexp': /^\w{3,}/,
		'error': 'Please enter the name of a type of instrument.'
		},
		'email': {
		'regexp': /^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/,
		'error': 'Please enter a valid email address.'
		},
		'staff_email': {
		'regexp': /^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/,
		'error': 'Please enter a valid email address.'
		},
		'username':{
		'regexp': /^\w{4,}$/,
		'error': 'Please enter your username.'
		},
		'password':{
		'regexp': /^\w{4,}$/,
		'error': 'Please enter your password.'
		},
		'newpwd1':{
		'regexp': /^\w{4,}$/,
		'error': 'Your password must be at least 4 characters long.'
		},
		'newpwd2':{
		'regexp': /^\w{4,}$/,
		'error': 'Please retype your new password.'
		},
		'url': {
		'regexp': /^http/,
		'error': 'A url must begin with http.'
		},
		'link_text': {
		'regexp': /^\w{1,}/,
		'error': 'Please enter the words that should appear for this link.'
		},
		'sort_order': {
		'regexp': /^[1-9]{1}\d{0,2}$/,
		'error': 'Please enter a number between 1 and 255.'
		}
	};
	
	var fm=form.elements
		
	for(var i=0; i<fm.length; i++){
		var field=fm[i].name;
		
		if (validationSet[field]){
			var re = validationSet[field]['regexp'];
			if(!re.test(fm[i].value)){
				var error_target=field + "_error";
				var output_error=document.getElementById(error_target);
				output_error.innerHTML=validationSet[field]['error'];
				output_error.style.display="block";
				fm[i].focus();
				return false;
				}
			}
		}
return true;
}

//checks dropDownMenu
	function dropDownMenu(form)  {
		var myindex=document.forms[0].menu.selectedIndex;
		if (myindex==0) {
			alert("\nYou must make a selection from the drop-down menu.");
			document.forms[0].menu.focus();
			}else{
			menu_selection=document.forms[0].menu.options[myindex].value;
			return true;
   			}
		}

//textarea character counter
                                                
function textCounter(field,cntfield,maxlimit) 
       { 
        if (field.value.length > maxlimit) { 
               field.value = field.value.substring(0, maxlimit); 
               }else{
               cntfield.value = maxlimit - field.value.length;
               }
         }
         
//clear error

function clearError(field){
	var error_target=field.name + "_error";
	var output_error=document.getElementById(error_target);
	if(output_error){
	output_error.innerHTML="";
	output_error.style.display="none";
	}
}

//check field match
function checkMatch(field1,field2){
	var error_target=field2.name + "_error";
	var output_error=document.getElementById(error_target);
	
	if(field1.value!=field2.value){
		output_error.innerHTML="Entries do not match.";
		output_error.style.display="block";
		field2.focus();
		return false;
	}else{
		output_error.style.display="none";
	}
}

//set focus in first form field
function setFocus(target){
							target.focus();
							}
							
//duplicate form section as needed
function addField(area,template,prefix,limit) {

	if(!document.getElementById) return; //exit if older browser
	
	var field_area = document.getElementById(area);

	var all_inputs = field_area.getElementsByTagName("div"); //Count the divisions
	if(all_inputs){
	var last_item = all_inputs.length - 1;
	var last = all_inputs[last_item].id;
	var count = Number(last.split("_")[1]) + 1; //this will be the number of the next row
	}else{
	count=1;
	}

	//If the maximum number of elements have been reached, exit the function.
	//If the given limit is lower than 0, infinite number of fields can be created.
	if(count > limit && limit > 0) return;

	var section=document.getElementById(template);
	var section_info=section.innerHTML;
	document.getElementById((prefix)+"section_count").value=count;
	//var array_marker="_"+(count);
	var array_marker="["+(count)+"]";
	
	section_info=section_info.replace(/\[0\]/g,array_marker);
	field_area.innerHTML += "<div class='form_rows' id='"+(prefix)+"section_"+(count)+"'>"+(section_info)+"</div>";
	//alert(section_info);
	
}

function removeField(area,prefix) {

	if(!document.getElementById) return; //exit if older browser
	
	var field_area = document.getElementById(area);

	var all_inputs = field_area.getElementsByTagName("div"); //Count the divisions
	if(all_inputs){
	var last_item = all_inputs.length - 1;
	var last = all_inputs[last_item].id;
	var count = Number(last.split("_")[1]) + 1; //this will be the number of the next row
	}else{
	count=1;
	}
	if(count>1){
	var last_section=document.getElementById((prefix)+"section_"+(count-1));
	field_area.removeChild(last_section);
	}
}