function btnConform(){

	var inputs = document.getElementsByTagName("input");

	for( var i=0,j=inputs.length; i<j; i++){

		var btn = inputs[i]; 

		if(btn.getAttribute("class") == "input_btn"){

			btn.onmouseover = function(){

				this.style.backgroundPosition = 'left -64px';

				return false;

			}

			btn.onmouseout = function(){

				this.style.backgroundPosition = 'left top';

				return false;

			}

		}

		if(btn.getAttribute("className") == "input_btn"){

			btn.onmouseover = function(){

				this.style.backgroundPosition = 'left -64px';

				return false;

			}

			btn.onmouseout = function(){

				this.style.backgroundPosition = 'left top';

				return false;

			}

		}

	}

}



window.onload = btnConform;