jquery simple codes

What is jquery..?

jquery javascript ka advanced version hai jo ki basically animation ke liye use kar jaati hai.

simplest code for onfocus and onblur.

function clearText(field) {

    if (field.defaultValue == field.value) field.value = '';
    else if (field.value == '') field.value = field.defaultValue;
}

simplest code of targetoffset for scrolldown. 

function cat_click(){
var targetOffset = $('.category_list').offset().top;
      $('html,body').animate({ scrollTop: targetOffset }, 1000);
}