function checkEnter(e){ //e is event object passed from function invocation
		var characterCode; //literal character code will be stored in this variable
		if(e && e.which)
		     { //if which property of event object is supported (NN4)
				 e = e;
				 characterCode = e.which; //character code is contained in NN4's which property
				 }
		else
				{
				e = event;
				characterCode = e.keyCode; //character code is contained in IE's keyCode property
				}

				if(characterCode == 13)
				  { //if generated character code is equal to ascii 13 (if enter key)
												 SearchIt();
												 return false ;
					}
					else
					{
					return true ;
					}
}