function hoverButton() {
   if (document.getElementById) {
     inputs = document.getElementsByTagName("input");
     for (i=0;i < inputs.length; i++) {
       if (inputs[i].className=="submit_search") {
		inputs[i].onmouseover=function() {
            this.className+="_over";
         }
          inputs[i].onmouseout=function() {
           this.className=this.className.replace ("_over", "");
 	    }
      }
	  else if (inputs[i].className == "charts_btn_vote") {
		inputs[i].onmouseover=function() {
            this.className+="_over";
         }
          inputs[i].onmouseout=function() {
           this.className=this.className.replace ("_over", "");
 	    }
      }
	  
     }
   }
 }