nv_1_off=new Image(); nv_1_off.src="images/list_numerically.gif"
nv_1_on=new Image(); nv_1_on.src="images/list_numerically_over.gif"

nv_2_off=new Image(); nv_2_off.src="images/list_alpa.gif"
nv_2_on=new Image(); nv_2_on.src="images/list_alpa_over.gif"

nv_3_off=new Image(); nv_3_off.src="images/int_numbers.gif"
nv_3_on=new Image(); nv_3_on.src="images/int_numbers_over.gif"

nv_4_off=new Image(); nv_4_off.src="images/contact_us.gif"
nv_4_on=new Image(); nv_4_on.src="images/contact_us_over.gif"

nv_5_off=new Image(); nv_5_off.src="images/list_your_num.gif"
nv_5_on=new Image(); nv_5_on.src="images/list_your_num_over.gif"


function swapImg(img, state) {
		eval('document.' + img + '.src= ' + img + state + '.src')
}