function trim(x) {
  while((x.length>0) && (x.charAt(0)==' ')) {
    x = x.substring(1,x.length);
  }
  while((x.length>0) && (x.charAt(x.length-1)==' ')) {
    x = x.substring(0,x.length-1);
  }
  return x;
}
function setOperation(ev){
	var ss=document.getElementsByTagName("input");
	var cou=0;
	var eventName =  ev.srcElement.name;
	for(var i = 0;i<ss.length;i++){
	    if(ss[i].type=="text"){
		if(ss[i].name==eventName){
		   	cou++;
		}
	}	}
  		   if(event.keyCode==13&&cou>0){
		     document.getElementsByName("operation")[0].value="";
		   }
		   }
	 function gosup(suphref){
	  location=suphref;
	}