//Validate phone number for 10 digit US numbers.
	    //phoneField - The HTML input field containing the phone number to validate.
	    //format - Integer value that defines how to format the text field.
	    function validatePhone(phoneField, format) {
	        var num = phoneField.value.replace(/[^\d]/g, '');
	        if (num.length != 10) {
	            //Alert the user that the phone number entered was invalid.
	            return false;
	        } else {
	            switch (format) {
	                case '0': //Format (xxx)-xxx-xxxx
	                    phoneField.value = "(" + num.substring(0, 3) + ")-" + num.substring(3, 6) + "-" + num.substring(6);
	                    break;
	                case '1': //Format xxx-xxx-xxxx
	                    phoneField.value = num.substring(0, 3) + "-" + num.substring(3, 6) + "-" + num.substring(6);
	                    break;
	                default: //Format xxxxxxxxxx
	                    phoneField.value = num;
	                    break;
	            }
	            return true;
	        }
	    }
	    
	    
/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

String.prototype.trim = function() {
    return this.replace(/^\s*/, "").replace(/\s*$/, "");
}


function validateandsubmit(){
	        
                    if(document.mainform.product.value.trim() == ""){
                        alert("Select a Product.");
                        document.mainform.product.focus();
                        return false;
                    }
                    if (document.mainform.category.value.trim() == "") {
                        alert("Select a Category.");
                        document.mainform.category.focus();
                        return false;
                    }
                    if (document.mainform.engine_type.value.trim() == "") {
                        alert("Select an Engine Type.");
                        document.mainform.engine_type.focus();
                        return false;
                    }
                    if (document.mainform.purchase_date.value.trim() != "") {
                        if(!isDate(document.mainform.purchase_date.value)){
                            document.mainform.purchase_date.focus();
                            return false;
                        }                       
                    }


                    if (document.mainform.first_name.value.trim() == "") {
                        alert("Enter your First Name.");
                        document.mainform.first_name.focus();
                        return false;
                    }
                    if (document.mainform.last_name.value.trim() == "") {
                        alert("Enter your Last Name.");
                        document.mainform.last_name.focus();
                        return false;
                    }
                    if (document.mainform.email.value.trim() == "") {
                        alert("Enter your Email.");
                        document.mainform.email.focus();
                        return false;
                    }
                    if (document.mainform.address.value.trim() == "") {
                        alert("Enter your Address.");
                        document.mainform.address.focus();
                        return false;
                    }
                    if (document.mainform.city.value.trim() == "") {
                        alert("Enter your City.");
                        document.mainform.city.focus();
                        return false;
                    }
                    if (document.mainform.state.value.trim() == "" && (document.mainform.country.value == "United States" || document.mainform.country.value == "Canada")) {
                        alert("Enter your State.");
                        document.mainform.state.focus();
                        return false;
                    }
                    if (document.mainform.zip_postal_code.value.trim() == "") {
                        alert("Enter your Zip/Postal Code.");
                        document.mainform.zip_postal_code.focus();
                        return false;
                    }
                    if (document.mainform.country.value.trim() == "") {
                        alert("Select your Country.");
                        document.mainform.country.focus();
                        return false;
                    }
                    if(!validatePhone(document.mainform.phone, "1")){
                        alert("Enter a valid Phone Number.");
                        document.mainform.phone.focus();
                        return false;
                    }
                    if (document.mainform.question_comments.value.trim() == "") {
                        alert("Enter your Question/Comments.");
                        document.mainform.question_comments.focus();
                        return false;
                    }
           
	    
	        document.forms[1].submit();	        
	  
	    }