Increase Decrease Quantity Button

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
	<head>
		<title>Increase Decrease Button </title>
		
		<script type="text/javascript">
		  function incre(){
      
                            document.getElementById("qty").value++;
                         }
                  function decre(){
                         var ckVal = document.getElementById("qty").value;
                   if(ckVal > '0') {
                       document.getElementById("qty").value--;
                      }
                   }
		</script>
	</head>
	<body>
		   <form name="DemoForm">
                               
                                    <input type='button' class="pull-left" name='incre' onclick='incre();' value='+'/>
                                    <input type='text' name='qty' value="1" id='qty' style="width:65px;" size="3"  class="pull-left" />
                                    <input type='button' class="pull-left" name='decre' onclick='decre();' value='-'/>
                  </form>
	</body>
</html>

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