Magento shopping cart add reduce quantity update shopping cart in real time

Magento updates the quantity of items in the shopping cart in real time

<TD> <button onclick = "addqtyone ();" type = "Submit"> + </button> <input id = "qtypro" name = "cart [<? PHP echo $ _ item-> GETID ()?>] [Qty] "value =" <? PHP echo $ this-> getqty ()?> "Size =" 4 "Title =" <? PHP echo $ this->__ ('qty ')?> "Maxlength =" 12 "/> <button type =" Submit "onclick =" redqtyone (); ">-</button> <div> </TD> <SCRIPT type =" text/JavaScript "> function addqtyone () {var qtypro = $ ('qtypro'); qtypro. value = parseint (qtypro. value) + 1;} function redqtyone () {var qtypro =$ ('qtypro'); qtypro. value = parseint (qtypro. value)-1 ;}</SCRIPT>