for browsers not supporting HTML5 placeholder attribute

placeholder.js

function activatePlaceholders() {
    var detect = navigator.userAgent.toLowerCase();
    if (detect.indexOf('safari') > 0) {
            return false;
    }
    var inputs = document.getElementsByTagName('input');
    for (var i=0;i<inputs.length;i++) {
        if (inputs[i].getAttribute('type') == 'text') {
            if (inputs[i].getAttribute('placeholder') && inputs[i].getAttribute('placeholder').length > 0) {
                var className = inputs[i].getAttribute('class');
                if(inputs[i].value.length < 1){
                    inputs[i].setAttribute('class', className + " placeholders");
                }
                inputs[i].onclick = function() {
                        if (this.value == this.getAttribute('placeholder')) {
                            var className = inputs[i].getAttribute('class');
                            className.replace('placeholders', '');
                            this.setAttribute('class', className);
                            this.value = '';
                        }
                        return false;
                    }
                inputs[i].onblur = function() {
                    if (this.value.length < 1) {
                        this.value = this.getAttribute('placeholder');
                        var className = inputs[i].getAttribute('class');
                        this.setAttribute('class', className + " placeholders");
                    }
                }
                inputs[i].value = inputs[i].getAttribute('placeholder');
            }
        }
    }
}