var minimumSizeCheck = function(target,minNum){
var regNumber = /^[0-9]*$/;
var val = $(target).val();
if( val < 700 || val == '' || !regNumber.test(val) ) $(target).val(minNum);
};
$('#width, #height').on('blur',function(){
minimumSizeCheck('#width','700');
minimumSizeCheck('#height','400');
});
var $chk = $('#checkboxId');
var formData = $('#formId').serializeArray();
if(!$chk.is(':checked')){
formData.push({
name : $chk.attr('name'),
value : false
});
}