var inputs = document.getElementsByTagName("input_100");
for (i=0; i < inputs.length; i++) {
	inputs[i].onfocus=function() {this.className='input_100_focus'};
	inputs[i].onblur=function() {this.className=''};
}

var inputs = document.getElementsByTagName("input_150");
for (i=0; i < inputs.length; i++) {
	inputs[i].onfocus=function() {this.className='input_150_focus'};
	inputs[i].onblur=function() {this.className=''};
}

var inputs = document.getElementsByTagName("input_450");
for (i=0; i < inputs.length; i++) {
	inputs[i].onfocus=function() {this.className='input_450_focus'};
	inputs[i].onblur=function() {this.className=''};
}