/********************************
* returns array of forms input values
* if they are checked.
*
* fromName: Name of the form to look for
* formInputName: name of the checkboxes to get values from
*********************************/
function getInputArray(formName, formInputName)
{
	var inputs = document.forms[formName][formInputName];
	var values;// =  new Array();
	for(var i = 0;i < inputs.length;i++)
	{
		if(inputs[i].checked)
			values = inputs[i].value;
	}
	
	return values;
}

function validateSurvey()
{
	if(document.getElementById("savetemp").value=="true")
		return true;
		
	var el = document.forms['questionform'].elements;
	
	var errorString = "";
	for(var i = 0;i < el.length;i++)//for each form element
	{
		var value = null;
		var name = el[i].name;
		
		switch (el[i].type)//input type
		{
			case 'hidden':
				value = 'ignore';
				break;
			case 'submit':
				value = 'ignore';
				break;
			case 'checkbox': //currently all check boxes are array of sames names
				//if(el[i].checked)
				value = 'ignore';//this.getInputArray('questionform',name);//gets all the values of same named checkboxes in an array
				
				break;
			case 'radio': //currently all check boxes are array of sames names
					value = this.getInputArray('questionform',name);
					break;
			case 'text':
				if(el[i].value != "")
					value = el[i].value;
				break;
			case 'textarea':
				if(el[i].value != "")
					value = el[i].value;
				break;
				
			case 'select-one':
				
				if(el[i].selectedIndex!=-1){
				if(el[i].options[el[i].selectedIndex].value != "")
					value = new Array(el[i].options[el[i].selectedIndex].value);
				}
				break;
			case 'select-multiple':
				value = new Array();
				for(var j = 0;j < el[i].length;j++)
				{
					if(el[i].options[j].selected)
						value.push(el[i].options[j].value);
				}
				break;
					
			default:
				break;
		}
		if($('err'+name))
			$('err'+name).style.display = 'none';
			
		if(value == null)
		{
			
			//alert('err'+name);
			if($('err'+name)){
				$('err'+name).style.display = '';
				errorString = "Please answer all questions";
			}
		
		}
	}
	
	//error in form, stop
	if(errorString != "")
	{
		alert(errorString);
		return false;
	}
	
	return true;
}

function extractNumber(obj, decimalPlaces, allowNegative)
{
	var temp = obj.value;
	
	// avoid changing things if already formatted correctly
	var reg0Str = '[0-9]*';
	if (decimalPlaces > 0) {
		reg0Str += '\\.?[0-9]{0,' + decimalPlaces + '}';
	} else if (decimalPlaces < 0) {
		reg0Str += '\\.?[0-9]*';
	}
	reg0Str = allowNegative ? '^-?' + reg0Str : '^' + reg0Str;
	reg0Str = reg0Str + '$';
	var reg0 = new RegExp(reg0Str);
	if (reg0.test(temp)) return true;

	// first replace all non numbers
	var reg1Str = '[^0-9' + (decimalPlaces != 0 ? '.' : '') + (allowNegative ? '-' : '') + ']';
	var reg1 = new RegExp(reg1Str, 'g');
	temp = temp.replace(reg1, '');

	if (allowNegative) {
		// replace extra negative
		var hasNegative = temp.length > 0 && temp.charAt(0) == '-';
		var reg2 = /-/g;
		temp = temp.replace(reg2, '');
		if (hasNegative) temp = '-' + temp;
	}
	
	if (decimalPlaces != 0) {
		var reg3 = /\./g;
		var reg3Array = reg3.exec(temp);
		if (reg3Array != null) {
			// keep only first occurrence of .
			//  and the number of places specified by decimalPlaces or the entire string if decimalPlaces < 0
			var reg3Right = temp.substring(reg3Array.index + reg3Array[0].length);
			reg3Right = reg3Right.replace(reg3, '');
			reg3Right = decimalPlaces > 0 ? reg3Right.substring(0, decimalPlaces) : reg3Right;
			temp = temp.substring(0,reg3Array.index) + '.' + reg3Right;
		}
	}
	
	obj.value = temp;
}
function blockNonNumbers(obj, e, allowDecimal, allowNegative)
{
	var key;
	var isCtrl = false;
	var keychar;
	var reg;
		
	if(window.event) {
		key = e.keyCode;
		isCtrl = window.event.ctrlKey
	}
	else if(e.which) {
		key = e.which;
		isCtrl = e.ctrlKey;
	}
	
	if (isNaN(key)) return true;
	
	keychar = String.fromCharCode(key);
	
	// check for backspace or delete, or if Ctrl was pressed
	if (key == 8 || isCtrl)
	{
		return true;
	}

	reg = /\d/;
	var isFirstN = allowNegative ? keychar == '-' && obj.value.indexOf('-') == -1 : false;
	var isFirstD = allowDecimal ? keychar == '.' && obj.value.indexOf('.') == -1 : false;
	
	return isFirstN || isFirstD || reg.test(keychar);
}

function updateHeight(list,element)
{
    val = $(list).options[$(list).selectedIndex].value;
    if(val=="inches")
    {
        $(element).value = Math.round($(element).value*0.39370079);
    }
    else
    {
        $(element).value = Math.round($(element).value*2.54);
    }
}

function updateWeight(list,element)
{
    val = $(list).options[$(list).selectedIndex].value;
    if(val=="pounds")
    {
        $(element).value = Math.round($(element).value*2.2046226);
    }
    else
    {
        $(element).value = Math.round($(element).value*0.45359237);
    }
}