Delete default value of an input text on click

Question

I have an input text :

I want to put a default value like

Answer 1

Here is very simple javascript. It works fine for me :

// JavaScript:

function sFocus (field) {
    if(field.value == 'Enter your search') {
        field.value = '';
    }
    field.className = "darkinput";
}

function sBlur (field) {
    if (field.value == '') {
        field.value = 'Enter your search';
        field.className = "lightinput";
    }
    else {
        field.className = "darkinput";
    }
}
// HTML

  Search for