function alpha_numeric()
{
	if(((event.keyCode>=65) && (event.keyCode<=90)) ||((event.keyCode>=97) && (event.keyCode<=122)) || ((event.keyCode>=48) && (event.keyCode<=57)) )
	  {}
	else{event.keyCode=0;}
}
function alpha_numeric_withdot()
{
	if(((event.keyCode>=65) && (event.keyCode<=90)) ||((event.keyCode>=97) && (event.keyCode<=122)) || ((event.keyCode>=44) && (event.keyCode<=57)))// ||(event.keycode=46)))
	  {}
	else{event.keyCode=0;}
}
function alphabet()
{
	if(((event.keyCode>=65) && (event.keyCode<=90)) ||((event.keyCode>=97) && (event.keyCode<=122)))
	  {}
	else{event.keyCode=0;}
}
		
function numeric()
{
	if((event.keyCode>57) || (event.keyCode<48))
	{
	  event.keyCode=0;
	}
}